File: rfc1156.txt

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Network Working Group                                     K. McCloghrie
Request For Comments:  1156                          Hughes LAN Systems
Obsoletes:  RFC 1066                                            M. Rose
                                      Performance Systems International
                                                               May 1990


           Management Information Base for Network Management
                       of TCP/IP-based internets

                           Table of Contents

   1. Status of this Memo ...................................   1
   2. IAB Policy Statement ..................................   2
   3. Introduction ..........................................   2
   4. Objects ...............................................   6
   4.1 Object Groups ........................................   6
   4.2 Format of Definitions ................................   7
   5. Object Definitions ....................................   8
   5.1 The System Group .....................................   9
   5.2 The Interfaces Group .................................  11
   5.2.1 The Interfaces Table ...............................  11
   5.3 The Address Translation Group ........................  23
   5.4 The IP Group .........................................  26
   5.4.1 The IP Address Table ...............................  34
   5.4.2 The IP Routing Table ...............................  36
   5.5 The ICMP Group .......................................  43
   5.6 The TCP Group ........................................  53
   5.7 The UDP Group ........................................  62
   5.8 The EGP Group ........................................  64
   5.8.1 The EGP Neighbor Table .............................  65
   6. Definitions ...........................................  68
   7. Acknowledgements ......................................  89
   8. References ............................................  90
   9. Security Considerations................................  91
   10. Authors' Addresses....................................  91

1.  Status of this Memo

   This RFC is a re-release of RFC 1066, with a changed "Status of this
   Memo", "IAB Policy Statement", and "Introduction" sections plus a few
   minor typographical corrections.  The technical content of the
   document is unchanged from RFC 1066.

   This memo provides the initial version of the Management Information
   Base (MIB) for use with network management protocols in TCP/IP-based
   internets in the short-term.  In particular, together with its
   companion memos which describe the structure of management



McCloghrie & Rose                                               [Page 1]

RFC 1156                          MIB                           May 1990


   information along with the initial network management protocol, these
   documents provide a simple, workable architecture and system for
   managing TCP/IP-based internets and in particular the Internet.

   This memo specifies a Standard Protocol for the Internet community.
   TCP/IP implementations in the Internet which are network manageable
   are expected to adopt and implement this specification.

   The Internet Activities Board recommends that all IP and TCP
   implementations be network manageable.  This implies implementation
   of the Internet MIB (RFC-1156) and at least one of the two
   recommended management protocols SNMP (RFC-1157) or CMOT (RFC-1095).
   It should be noted that, at this time, SNMP is a full Internet
   standard and CMOT is a draft standard.  See also the Host and Gateway
   Requirements RFCs for more specific information on the applicability
   of this standard.

   Please refer to the latest edition of the "IAB Official Protocol
   Standards" RFC for current information on the state and status of
   standard Internet protocols.

   Distribution of this memo is unlimited.

2.  IAB Policy Statement

   This MIB specification is the first edition of an evolving document
   defining variables needed for monitoring and control of various
   components of the Internet.  Not all groups of defined variables are
   mandatory for all Internet components.

   For example, the EGP group is mandatory for gateways using EGP but
   not for hosts which should not be running EGP.  Similarly, the TCP
   group is mandatory for hosts running TCP but not for gateways which
   aren't running it.  What IS mandatory, however, is that all variables
   of a group be supported if any element of the group is supported.

   It is expected that additional MIB groups and variables will be
   defined over time to accommodate the monitoring and control needs of
   new or changing components of the Internet.  The responsible working
   group(s) will continue to refine this specification.

3.  Introduction

   As reported in RFC 1052, IAB Recommendations for the Development of
   Internet Network Management Standards [1], the Internet Activities
   Board has directed the Internet Engineering Task Force (IETF) to
   create two new working groups in the area of network management.  One
   group was charged with the further specification and definition of



McCloghrie & Rose                                               [Page 2]

RFC 1156                          MIB                           May 1990


   elements to be included in the Management Information Base.  The
   other was charged with defining the modifications to the Simple
   Network Management Protocol (SNMP) to accommodate the short-term
   needs of the network vendor and operator communities.  In the long-
   term, the use of the OSI network management framework was to be
   examined using the ISO CMIS/CMIP [2,3] framework as a basis.  Two
   documents were produced to define the management information:  RFC
   1065, which defined the Structure of Management Information (SMI)
   [4], and RFC 1066, which defined the Management Information Base
   (MIB) [5].  Both of these documents were designed so as to be
   compatible with both the SNMP and the OSI network management
   framework.

   This strategy was quite successful in the short-term: Internet-based
   network management technology was fielded, by both the research and
   commercial communities, within a few months.  As a result of this,
   portions of the Internet community became network manageable in a
   timely fashion.

   As reported in RFC 1109, Report of the Second Ad Hoc Network
   Management Review Group [6], the requirements of the SNMP and the OSI
   network management frameworks were more different than anticipated.
   As such, the requirement for compatibility between the SMI/MIB and
   both frameworks was suspended.

   The IAB has designated the SNMP, SMI, and the initial Internet MIB to
   be full "Standard Protocols" with "Recommended" status.  By this
   action, the IAB recommends that all IP and TCP implementations be
   network manageable and that the implementations that are network
   manageable are expected to adopt and implement the SMI, MIB, and
   SNMP.

   As such, the current network management framework for TCP/IP- based
   internets consists of:  Structure and Identification of Management
   Information for TCP/IP-based Internets, which describes how managed
   objects contained in the MIB are defined as set forth in RFC 1155
   [7]; Management Information Base for Network Management of TCP/IP-
   based Internets, which describes the managed objects contained in the
   MIB as set forth in this memo; and, the Simple Network Management
   Protocol, which defines the protocol used to manage these objects, as
   set forth in RFC 1157 [8].

   The IAB also urged the working groups to be "extremely sensitive to
   the need to keep SNMP simple," and recommends that the MIB working
   group take as its starting inputs the MIB definitions found in the
   High-Level Entity Management Systems (HEMS) RFC 1024 [9], the initial
   SNMP specification [10], and the CMIS/CMIP memos [11,12].




McCloghrie & Rose                                               [Page 3]

RFC 1156                          MIB                           May 1990


   Thus, the list of managed objects defined here, has been derived by
   taking only those elements which are considered essential.  Since
   such elements are essential, there is no need to allow the
   implementation of individual objects, to be optional.  Rather, all
   compliant implementations will contain all applicable (see below)
   objects defined in this memo.

   This approach of taking only the essential objects is NOT
   restrictive, since the SMI defined in the companion memo provides
   three extensibility mechanisms:  one, the addition of new standard
   objects through the definitions of new versions of the MIB; two, the
   addition of widely-available but non-standard objects through the
   multilateral subtree; and three, the addition of private objects
   through the enterprises subtree. Such additional objects can not only
   be used for vendor-specific elements, but also for experimentation as
   required to further the knowledge of which other objects are
   essential.

   The primary criterion for being considered essential was for an
   object to be contained in all of the above referenced MIB
   definitions.  A few other objects have been included, but only if the
   MIB working group believed they are truly essential.  The detailed
   list of criteria against which potential inclusions in this (initial)
   MIB were considered, was:

      1) An object needed to be essential for either fault or
         configuration management.

      2) Only weak control objects were permitted (by weak, it
         is meant that tampering with them can do only limited
         damage).  This criterion reflects the fact that the
         current management protocols are not sufficiently secure
         to do more powerful control operations.

      3) Evidence of current use and utility was required.

      4) An attempt was made to limit the number of objects to
         about 100 to make it easier for vendors to fully
         instrument their software.

      5) To avoid redundant variables, it was required that no
         object be included that can be derived from others in the
         MIB.

      6) Implementation specific objects (e.g., for BSD UNIX)
         were excluded.

      7) It was agreed to avoid heavily instrumenting critical



McCloghrie & Rose                                               [Page 4]

RFC 1156                          MIB                           May 1990


         sections of code.  The general guideline was one counter
         per critical section per layer.

















































McCloghrie & Rose                                               [Page 5]

RFC 1156                          MIB                           May 1990


4.  Objects

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using Abstract Syntax Notation One (ASN.1) [13].

   The mechanisms used for describing these objects are specified in the
   companion memo.  In particular, each object has a name, a syntax, and
   an encoding.  The name is an object identifier, an administratively
   assigned name, which specifies an object type.  The object type
   together with an object instance serves to uniquely identify a
   specific instantiation of the object.  For human convenience, we
   often use a textual string, termed the OBJECT DESCRIPTOR, to also
   refer to the object type.

   The syntax of an object type defines the abstract data structure
   corresponding to that object type.  The ASN.1 language is used for
   this purpose.  However, the companion memo purposely restricts the
   ASN.1 constructs which may be used.  These restrictions are
   explicitly made for simplicity.

   The encoding of an object type is simply how that object type is
   represented using the object type's syntax.  Implicitly tied to the
   notion of an object type's syntax and encoding is how the object type
   is represented when being transmitted on the network.  This memo
   specifies the use of the basic encoding rules of ASN.1 [14].

4.1.  Object Groups

   Since this list of managed objects contains only the essential
   elements, there is no need to allow individual objects to be
   optional.  Rather, the objects are arranged into the following
   groups:

                  - System
                  - Interfaces
                  - Address Translation
                  - IP
                  - ICMP
                  - TCP
                  - UDP
                  - EGP

   There are two reasons for defining these groups:  one, to provide a
   means of assigning object identifiers; two, to provide a method for
   implementations of managed agents to know which objects they must
   implement.  This method is as follows: if the semantics of a group is
   applicable to an implementation, then it must implement all objects



McCloghrie & Rose                                               [Page 6]

RFC 1156                          MIB                           May 1990


   in that group.  For example, an implementation must implement the EGP
   group if and only if it implements the EGP protocol.

4.2.  Format of Definitions

   The next section contains the specification of all object types
   contained in the MIB. Following the conventions of the companion
   memo, the object types are defined using the following fields:

          OBJECT:
          -------
               A textual name, termed the OBJECT DESCRIPTOR, for the
               object type, along with its corresponding OBJECT
               IDENTIFIER.

          Syntax:
               The abstract syntax for the object type, presented using
               ASN.1.  This must resolve to an instance of the ASN.1
               type ObjectSyntax defined in the SMI.

          Definition:
               A textual description of the semantics of the object
               type.  Implementations should ensure that their
               interpretation of the object type fulfills this
               definition since this MIB is intended for use in multi-
               vendor environments.  As such it is vital that object
               types have consistent meaning across all machines.

          Access:
               One of read-only, read-write, write-only, or
               not-accessible.

          Status:
              One of mandatory, optional, or obsolete.

















McCloghrie & Rose                                               [Page 7]

RFC 1156                          MIB                           May 1990


5.  Object Definitions

               RFC1156-MIB

               DEFINITIONS ::= BEGIN

               IMPORTS
                       mgmt, OBJECT-TYPE, NetworkAddress, IpAddress,
                       Counter, Gauge, TimeTicks
                           FROM RFC1155-SMI;

               mib        OBJECT IDENTIFIER ::= { mgmt 1 }

               system     OBJECT IDENTIFIER ::= { mib 1 }
               interfaces OBJECT IDENTIFIER ::= { mib 2 }
               at         OBJECT IDENTIFIER ::= { mib 3 }
               ip         OBJECT IDENTIFIER ::= { mib 4 }
               icmp       OBJECT IDENTIFIER ::= { mib 5 }
               tcp        OBJECT IDENTIFIER ::= { mib 6 }
               udp        OBJECT IDENTIFIER ::= { mib 7 }
               egp        OBJECT IDENTIFIER ::= { mib 8 }

               END




























McCloghrie & Rose                                               [Page 8]

RFC 1156                          MIB                           May 1990


5.1.  The System Group

          Implementation of the System group is mandatory for all
          systems.

          OBJECT:
          -------
               sysDescr { system 1 }

          Syntax:
               OCTET STRING

          Definition:
               A textual description of the entity.  This value should
               include the full name and version identification of the
               system's hardware type, software operating-system, and
               networking software.  It is mandatory that this only
               contain printable ASCII characters.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               sysObjectID { system 2 }

          Syntax:
               OBJECT IDENTIFIER

          Definition:
               The vendor's authoritative identification of the network
               management subsystem contained in the entity.  This value
               is allocated within the SMI enterprises subtree
               (1.3.6.1.4.1) and provides an easy and unambiguous means
               for determining "what kind of box" is being managed.  For
               example, if vendor "Flintstones, Inc." was assigned the
               subtree 1.3.6.1.4.1.42, it could assign the identifier
               1.3.6.1.4.1.42.1.1 to its "Fred Router".

          Access:
               read-only.

          Status:
               mandatory.



McCloghrie & Rose                                               [Page 9]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               sysUpTime { system 3 }

          Syntax:
               TimeTicks

          Definition:
               The time (in hundredths of a second) since the network
               management portion of the system was last re-initialized.

          Access:
               read-only.

          Status:
               mandatory.



































McCloghrie & Rose                                              [Page 10]

RFC 1156                          MIB                           May 1990


5.2.  The Interfaces Group

          Implementation of the Interfaces group is mandatory for all
          systems.

          OBJECT:
          -------
               ifNumber { interfaces 1 }

          Syntax:
               INTEGER

          Definition:
               The number of network interfaces (regardless of their
               current state) on which this system can send/receive IP
               datagrams.

          Access:
               read-only.

          Status:
               mandatory.

5.2.1.  The Interfaces Table

          OBJECT:
          -------
               ifTable { interfaces 2 }

          Syntax:
               SEQUENCE OF IfEntry

          Definition:
               A list of interface entries.  The number of entries is
               given by the value of ifNumber.

          Access:
               read-write.

          Status:
               mandatory.

          OBJECT:
          -------
               ifEntry { ifTable 1 }

          Syntax:
               IfEntry ::= SEQUENCE {



McCloghrie & Rose                                              [Page 11]

RFC 1156                          MIB                           May 1990


                    ifIndex
                        INTEGER,
                    ifDescr
                        OCTET STRING,
                    ifType
                        INTEGER,
                    ifMtu
                        INTEGER,
                    ifSpeed
                        Gauge,
                    ifPhysAddress
                        OCTET STRING,
                    ifAdminStatus
                        INTEGER,
                    ifOperStatus
                        INTEGER,
                    ifLastChange
                        TimeTicks,
                    ifInOctets
                        Counter,
                    ifInUcastPkts
                        Counter,
                    ifInNUcastPkts
                        Counter,
                    ifInDiscards
                        Counter,
                    ifInErrors
                        Counter,
                    ifInUnknownProtos
                        Counter,
                    ifOutOctets
                        Counter,
                    ifOutUcastPkts
                        Counter,
                    ifOutNUcastPkts
                        Counter,
                    ifOutDiscards
                        Counter,
                    ifOutErrors
                        Counter,
                    ifOutQLen
                        Gauge
               }

          Definition:
               An interface entry containing objects at the subnetwork
               layer and below for a particular interface.




McCloghrie & Rose                                              [Page 12]

RFC 1156                          MIB                           May 1990


          Access:
               read-write.

          Status:
               mandatory.


          We now consider the individual components of each interface
          entry:


          OBJECT:
          -------
               ifIndex { ifEntry 1 }

          Syntax:
               INTEGER

          Definition:
               A unique value for each interface.  Its value ranges
               between 1 and the value of ifNumber.  The value for each
               interface must remain constant at least from one re-
               initialization of the entity's network management system
               to the next re-initialization.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifDescr { ifEntry 2 }

          Syntax:
               OCTET STRING

          Definition:
               A text string containing information about the interface.
               This string should include the name of the manufacturer,
               the product name and the version of the hardware
               interface.  The string is intended for presentation to a
               human; it must not contain anything but printable ASCII
               characters.





McCloghrie & Rose                                              [Page 13]

RFC 1156                          MIB                           May 1990


          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifType { ifEntry 3 }

          Syntax:
               INTEGER {
                    other(1),          -- none of the following
                    regular1822(2),
                    hdh1822(3),
                    ddn-x25(4),
                    rfc877-x25(5),
                    ethernet-csmacd(6),
                    iso88023-csmacd(7),
                    iso88024-tokenBus(8),
                    iso88025-tokenRing(9),
                    iso88026-man(10),
                    starLan(11),
                    proteon-10MBit(12),
                    proteon-80MBit(13),
                    hyperchannel(14),
                    fddi(15),
                    lapb(16),
                    sdlc(17),
                    t1-carrier(18),
                    cept(19),          -- european equivalent of T-1
                    basicIsdn(20),
                    primaryIsdn(21),
                                        -- proprietary serial
                    propPointToPointSerial(22)
               }

          Definition:
               The type of interface, distinguished according to the
               physical/link/network protocol(s) immediately "below" IP
               in the protocol stack.

          Access:
               read-only.

          Status:
               mandatory.



McCloghrie & Rose                                              [Page 14]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ifMtu { ifEntry 4 }

          Syntax:
               INTEGER

          Definition:
               The size of the largest IP datagram which can be
               sent/received on the interface, specified in octets.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifSpeed { ifEntry 5 }

          Syntax:
               Gauge

          Definition:
               An estimate of the interface's current bandwidth in bits
               per second.  For interfaces which do not vary in
               bandwidth or for those where no accurate estimation can
               be made, this object should contain the nominal
               bandwidth.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifPhysAddress { ifEntry 6 }

          Syntax:
               OCTET STRING

          Definition:
               The interface's address at the protocol layer immediately



McCloghrie & Rose                                              [Page 15]

RFC 1156                          MIB                           May 1990


               "below" IP in the protocol stack.  For interfaces which
               do not have such an address (e.g., a serial line), this
               object should contain an octet string of zero length.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifAdminStatus { ifEntry 7 }

          Syntax:
               INTEGER {
                    up(1),       -- ready to pass packets
                    down(2),
                    testing(3)   -- in some test mode
                  }

           Definition:
               The desired state of the interface.  The testing(3) state
               indicates that no operational packets can be passed.

           Access:
               read-write.

           Status:
               mandatory.


          OBJECT:
          -------
               ifOperStatus { ifEntry 8 }

          Syntax:
               INTEGER {
                    up(1),       -- ready to pass packets
                    down(2),
                    testing(3)   -- in some test mode
               }

          Definition:
               The current operational state of the interface.  The
               testing(3) state indicates that no operational packets
               can be passed.



McCloghrie & Rose                                              [Page 16]

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          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifLastChange { ifEntry 9 }

          Syntax:
               TimeTicks

          Definition:
               The value of sysUpTime at the time the interface entered
               its current operational state.  If the current state was
               entered prior to the last re-initialization of the local
               network management subsystem, then this object contains a
               zero value.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifInOctets { ifEntry 10 }

          Syntax:
               Counter

          Definition:
               The total number of octets received on the interface,
               including framing characters.

          Access:
               read-only.

          Status:
               mandatory.







McCloghrie & Rose                                              [Page 17]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ifInUcastPkts  { ifEntry 11 }

          Syntax:
               Counter

          Definition:
               The number of (subnet) unicast packets delivered to a
               higher-layer protocol.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifInNUcastPkts { ifEntry 12 }

          Syntax:
               Counter

          Definition:
               The number of non-unicast (i.e., subnet broadcast or
               subnet multicast) packets delivered to a higher-layer
               protocol.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifInDiscards { ifEntry 13 }

          Syntax:
               Counter

          Definition:
               The number of inbound packets which were chosen to be
               discarded even though no errors had been detected to
               prevent their being deliverable to a higher-layer



McCloghrie & Rose                                              [Page 18]

RFC 1156                          MIB                           May 1990


               protocol.  One possible reason for discarding such a
               packet could be to free up buffer space.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifInErrors { ifEntry 14 }

          Syntax:
               Counter

          Definition:
               The number of inbound packets that contained errors
               preventing them from being deliverable to a higher-layer
               protocol.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifInUnknownProtos { ifEntry 15 }

          Syntax:
               Counter

          Definition:
               The number of packets received via the interface which
               were discarded because of an unknown or unsupported
               protocol.

          Access:
               read-only.

          Status:
              mandatory.





McCloghrie & Rose                                              [Page 19]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ifOutOctets { ifEntry 16 }

          Syntax:
               Counter

          Definition:
               The total number of octets transmitted out of the
               interface, including framing characters.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifOutUcastPkts { ifEntry 17 }

           Syntax:
               Counter

          Definition:
               The total number of packets that higher-level protocols
               requested be transmitted to a subnet-unicast address,
               including those that were discarded or not sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
              ifOutNUcastPkts { ifEntry 18 }

          Syntax:
               Counter

          Definition:
               The total number of packets that higher-level protocols
               requested be transmitted to a non-unicast (i.e., a subnet
               broadcast or subnet multicast) address, including those



McCloghrie & Rose                                              [Page 20]

RFC 1156                          MIB                           May 1990


               that were discarded or not sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifOutDiscards { ifEntry 19 }

          Syntax:
               Counter

          Definition:
               The number of outbound packets which were chosen to be
               discarded even though no errors had been detected to
               prevent their being transmitted.  One possible reason for
               discarding such a packet could be to free up buffer
               space.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ifOutErrors { ifEntry 20 }

          Syntax:
               Counter

          Definition:
               The number of outbound packets that could not be
               transmitted because of errors.

          Access:
               read-only.

          Status:
               mandatory.





McCloghrie & Rose                                              [Page 21]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ifOutQLen { ifEntry 21 }

          Syntax:
               Gauge

          Definition:
               The length of the output packet queue (in packets).

          Access:
               read-only.

          Status:
               mandatory.




































McCloghrie & Rose                                              [Page 22]

RFC 1156                          MIB                           May 1990


5.3.  The Address Translation Group

   Implementation of the Address Translation group is mandatory
   for all systems.

   The Address Translation group contains one table which is the
   union across all interfaces of the translation tables for
   converting a NetworkAddress (e.g., an IP address) into a
   subnetwork-specific address.  For lack of a better term, this
   document refers to such a subnetwork-specific address as a
   "physical" address.

   Examples of such translation tables are:  for broadcast media
   where ARP is in use, the translation table is equivalent to
   the ARP cache; or, on an X.25 network where non-algorithmic
   translation to X.121 addresses is required, the translation
   table contains the NetworkAddress to X.121 address
   equivalences.

          OBJECT:
          -------
               atTable { at 1 }

          Syntax:
               SEQUENCE OF AtEntry

          Definition:
               The Address Translation tables contain the NetworkAddress
               to "physical" address equivalences.  Some interfaces do
               not use translation tables for determining address
               equivalences (e.g., DDN-X.25 has an algorithmic method);
               if all interfaces are of this type, then the Address
               Translation table is empty, i.e., has zero entries.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               atEntry { atTable 1 }

          Syntax:
               AtEntry ::= SEQUENCE {
                    atIfIndex



McCloghrie & Rose                                              [Page 23]

RFC 1156                          MIB                           May 1990


                        INTEGER,
                    atPhysAddress
                        OCTET STRING,
                    atNetAddress
                        NetworkAddress
               }

          Definition:
               Each entry contains one NetworkAddress to "physical"
               address equivalence.

          Access:
               read-write.

          Status:
               mandatory.

          We now consider the individual components of each Address
          Translation table entry:


          OBJECT:
          -------
               atIfIndex { atEntry 1 }

          Syntax:
               INTEGER

          Definition:
               The interface on which this entry's equivalence is
               effective.  The interface identified by a particular
               value of this index is the same interface as identified
                by the same value of ifIndex.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               atPhysAddress { atEntry 2 }

          Syntax:
               OCTET STRING




McCloghrie & Rose                                              [Page 24]

RFC 1156                          MIB                           May 1990


          Definition:
               The media-dependent "physical" address.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               atNetAddress { atEntry 3 }

          Syntax:
               NetworkAddress

          Definition:
               The NetworkAddress (e.g., the IP address) corresponding to
               the media-dependent "physical" address.

          Access:
               read-write.

          Status:
               mandatory.

























McCloghrie & Rose                                              [Page 25]

RFC 1156                          MIB                           May 1990


5.4.  The IP Group

   Implementation of the IP group is mandatory for all systems.


          OBJECT:
          -------
               ipForwarding { ip 1 }

          Syntax:
               INTEGER {
                    gateway(1),   -- entity forwards datagrams
                    host(2)       -- entity does NOT forward datagrams
               }

          Definition:
               The indication of whether this entity is acting as an IP
               gateway in respect to the forwarding of datagrams
               received by, but not addressed to, this entity.  IP
               gateways forward datagrams; Hosts do not (except those
               Source-Routed via the host).

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipDefaultTTL { ip 2 }

          Syntax:
               INTEGER

          Definition:
               The default value inserted into the Time-To-Live field of
               the IP header of datagrams originated at this entity,
               whenever a TTL value is not supplied by the transport
               layer protocol.

          Access:
               read-write.

          Status:
               mandatory.




McCloghrie & Rose                                              [Page 26]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ipInReceives { ip 3 }

          Syntax:
               Counter

          Definition:
               The total number of input datagrams received from
               interfaces, including those received in error.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInHdrErrors { ip 4 }

          Syntax:
               Counter

          Definition:
               The number of input datagrams discarded due to errors in
               their IP headers, including bad checksums, version number
               mismatch, other format errors, time-to-live exceeded,
               errors discovered in processing their IP options, etc.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInAddrErrors { ip 5 }

          Syntax:
               Counter

          Definition:
               The number of input datagrams discarded because the IP
               address in their IP header's destination field was not a



McCloghrie & Rose                                              [Page 27]

RFC 1156                          MIB                           May 1990


               valid address to be received at this entity.  This count
               includes invalid addresses (e.g., 0.0.0.0) and addresses
               of unsupported Classes (e.g., Class E).  For entities
               which are not IP Gateways and therefore do not forward
               datagrams, this counter includes datagrams discarded
               because the destination address was not a local address.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipForwDatagrams { ip 6 }

          Syntax:
               Counter

          Definition:
               The number of input datagrams for which this entity was
               not their final IP destination, as a result of which an
               attempt was made to find a route to forward them to that
               final destination.  In entities which do not act as IP
               Gateways, this counter will include only those packets
               which were Source-Routed via this entity, and the
               Source-Route option processing was successful.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInUnknownProtos { ip 7 }

          Syntax:
               Counter

          Definition:
               The number of locally-addressed datagrams received
               successfully but discarded because of an unknown or
               unsupported protocol.



McCloghrie & Rose                                              [Page 28]

RFC 1156                          MIB                           May 1990


           Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInDiscards { ip 8 }

          Syntax:
               Counter

          Definition:
               The number of input IP datagrams for which no problems
               were encountered to prevent their continued processing,
               but which were discarded (e.g. for lack of buffer space).
               Note that this counter does not include any datagrams
               discarded while awaiting re-assembly.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipInDelivers { ip 9 }

          Syntax:
               Counter

          Definition:
               The total number of input datagrams successfully
               delivered to IP user-protocols (including ICMP).

          Access:
               read-only.

          Status:
               mandatory.

          OBJECT:
          -------
               ipOutRequests { ip 10 }



McCloghrie & Rose                                              [Page 29]

RFC 1156                          MIB                           May 1990


          Syntax:
               Counter

          Definition:
               The total number of IP datagrams which local IP user-
               protocols (including ICMP) supplied to IP in requests for
               transmission.  Note that this counter does not include
               any datagrams counted in ipForwDatagrams.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipOutDiscards { ip 11 }

          Syntax:
               Counter

          Definition:
               The number of output IP datagrams for which no problem
               was encountered to prevent their transmission to their
               destination, but which were discarded (e.g., for lack of
               buffer space).  Note that this counter would include
               datagrams counted in ipForwDatagrams if any such packets
               met this (discretionary) discard criterion.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipOutNoRoutes { ip 12 }

          Syntax:
               Counter







McCloghrie & Rose                                              [Page 30]

RFC 1156                          MIB                           May 1990


          Definition:
               The number of IP datagrams discarded because no route
               could be found to transmit them to their destination.
               Note that this counter includes any packets counted in
               ipForwDatagrams which meet this "no-route" criterion.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipReasmTimeout { ip 13 }

          Syntax:
               INTEGER

          Definition:
               The maximum number of seconds which received fragments
               are held while they are awaiting reassembly at this
               entity.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipReasmReqds { ip 14 }

          Syntax:
               Counter

          Definition:
               The number of IP fragments received which needed to be
               reassembled at this entity.

          Access:
               read-only.

          Status:
               mandatory.



McCloghrie & Rose                                              [Page 31]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ipReasmOKs { ip 15 }

          Syntax:
               Counter

          Definition:
               The number of IP datagrams successfully re-assembled.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipReasmFails { ip 16 }

          Syntax:
               Counter

          Definition:
               The number of failures detected by the IP re-assembly
               algorithm (for whatever reason:  timed out, errors, etc).

               Note that this is not necessarily a count of discarded IP
               fragments since some algorithms (notably RFC 815's) can
               lose track of the number of fragments by combining them
               as they are received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipFragOKs { ip 17 }

          Syntax:
              Counter





McCloghrie & Rose                                              [Page 32]

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          Definition:
               The number of IP datagrams that have been successfully
               fragmented at this entity.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipFragFails { ip 18 }

          Syntax:
               Counter

          Definition:
               The number of IP datagrams that have been discarded
               because they needed to be fragmented at this entity but
               could not be, e.g., because their "Don't Fragment" flag
               was set.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipFragCreates { ip 19 }

          Syntax:
               Counter

          Definition:
               The number of IP datagram fragments that have been
               generated as a result of fragmentation at this entity.

          Access:
               read-only.

          Status:
               mandatory.




McCloghrie & Rose                                              [Page 33]

RFC 1156                          MIB                           May 1990


5.4.1.  The IP Address Table

   The Ip Address table contains this entity's IP addressing
   information.


          OBJECT:
          -------
               ipAddrTable { ip 20 }

          Syntax:
               SEQUENCE OF IpAddrEntry

          Definition:
               The table of addressing information relevant to this
               entity's IP addresses.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipAddrEntry { ipAddrTable 1 }

          Syntax:
               IpAddrEntry ::= SEQUENCE {
                    ipAdEntAddr
                        IpAddress,
                    ipAdEntIfIndex
                        INTEGER,
                    ipAdEntNetMask
                        IpAddress,
                    ipAdEntBcastAddr
                        INTEGER
               }

          Definition:
               The addressing information for one of this entity's IP
               addresses.

          Access:
               read-only.





McCloghrie & Rose                                              [Page 34]

RFC 1156                          MIB                           May 1990


          Status:
               mandatory.


          OBJECT:
          -------
               ipAdEntAddr  { ipAddrEntry 1 }

          Syntax:
               IpAddress

          Definition:
               The IP address to which this entry's addressing
               information pertains.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipAdEntIfIndex  { ipAddrEntry 2 }

          Syntax:
               INTEGER

          Definition:
               The index value which uniquely identifies the interface
               to which this entry is applicable.  The interface
               identified by a particular value of this index is the
                same interface as identified by the same value of
                ifIndex.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipAdEntNetMask  { ipAddrEntry 3 }





McCloghrie & Rose                                              [Page 35]

RFC 1156                          MIB                           May 1990


          Syntax:
               IpAddress

          Definition:
               The subnet mask associated with the IP address of this
               entry.  The value of the mask is an IP address with all
               the network bits set to 1 and all the hosts bits set to
               0.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipAdEntBcastAddr { ipAddrEntry 4 }

          Syntax:
               INTEGER

          Definition:
               The value of the least-significant bit in the IP
               broadcast address used for sending datagrams on the
               (logical) interface associated with the IP address of
               this entry.  For example, when the Internet standard
               all-ones broadcast address is used, the value will be 1.

          Access:
               read-only.

          Status:
               mandatory.

5.4.2.  The IP Routing Table

   The IP Routing Table contains an entry for each route
   presently known to this entity.  Note that the action to be
   taken in response to a request to read a non-existent entry,
   is specific to the network management protocol being used.


          OBJECT:
          -------
               ipRoutingTable { ip 21 }




McCloghrie & Rose                                              [Page 36]

RFC 1156                          MIB                           May 1990


          Syntax:
               SEQUENCE OF IpRouteEntry

          Definition:
               This entity's IP Routing table.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               ipRouteEntry { ipRoutingTable 1 }

          Syntax:
               IpRouteEntry ::= SEQUENCE {
                    ipRouteDest
                        IpAddress,
                    ipRouteIfIndex
                        INTEGER,
                    ipRouteMetric1
                        INTEGER,
                    ipRouteMetric2
                        INTEGER,
                    ipRouteMetric3
                        INTEGER,
                    ipRouteMetric4
                        INTEGER,
                    ipRouteNextHop
                        IpAddress,
                    ipRouteType
                        INTEGER,
                    ipRouteProto
                        INTEGER,
                    ipRouteAge
                        INTEGER
               }

          Definition:
               A route to a particular destination.

          Access:
               read-write.





McCloghrie & Rose                                              [Page 37]

RFC 1156                          MIB                           May 1990


          Status:
               mandatory.

          We now consider the individual components of each route in the
          IP Routing Table:


          OBJECT:
          -------
               ipRouteDest { ipRouteEntry 1 }

          Syntax:
               IpAddress

          Definition:
               The destination IP address of this route.  An entry with
               a value of 0.0.0.0 is considered a default route.
               Multiple such default routes can appear in the table, but
               access to such multiple entries is dependent on the
               table-access mechanisms defined by the network management
               protocol in use.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               ipRouteIfIndex  { ipRouteEntry 2 }

          Syntax:
               INTEGER

          Definition:
               The index value which uniquely identifies the local
               interface through which the next hop of this route should
               be reached.  The interface identified by a particular
               value of this index is the same interface as identified
               by the same value of ifIndex.

          Access:
               read-write.

          Status:
               mandatory.



McCloghrie & Rose                                              [Page 38]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ipRouteMetric1 { ipRouteEntry 3 }

          Syntax:
               INTEGER

          Definition:
               The primary routing metric for this route.  The semantics
               of this metric are determined by the routing-protocol
               specified in the route's ipRouteProto value.  If this
               metric is not used, its value should be set to -1.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               ipRouteMetric2 { ipRouteEntry 4 }

          Syntax:
               INTEGER

          Definition:
               An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipRouteProto value.  If
               this metric is not used, its value should be set to -1.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               ipRouteMetric3 { ipRouteEntry 5 }

          Syntax:
               INTEGER





McCloghrie & Rose                                              [Page 39]

RFC 1156                          MIB                           May 1990


          Definition:
               An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipRouteProto value.  If
               this metric is not used, its value should be set to -1.

           Access:
               read-write.

           Status:
               mandatory.


          OBJECT:
          -------
               ipRouteMetric4 { ipRouteEntry 6 }

          Syntax:
               INTEGER

          Definition:
               An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipRouteProto value.  If
               this metric is not used, its value should be set to -1.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               ipRouteNextHop { ipRouteEntry 7 }

          Syntax:
               IpAddress

          Definition:
               The IP address of the next hop of this route.

          Access:
               read-write.

          Status:
               mandatory.



McCloghrie & Rose                                              [Page 40]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               ipRouteType { ipRouteEntry 8 }

          Syntax:
               INTEGER {
                    other(1),        -- none of the following

                    invalid(2),      -- an invalidated route

                                     -- route to directly
                    direct(3),       -- connected (sub-)network

                                     -- route to a non-local
                    remote(4),       -- host/network/sub-network
               }

          Definition:
               The type of route.

          Access:
               read-write.

          Status:
               mandatory.


          OBJECT:
          -------
               ipRouteProto { ipRouteEntry 9 }

          Syntax:
               INTEGER {
                    other(1),       -- none of the following

                                    -- non-protocol information,
                                    -- e.g., manually configured
                    local(2),       -- entries

                                    -- set via a network management
                    netmgmt(3),     -- protocol

                                    -- obtained via ICMP,
                    icmp(4),        -- e.g., Redirect

                                    -- the remaining values are
                                    -- all gateway routing protocols
                    egp(5),



McCloghrie & Rose                                              [Page 41]

RFC 1156                          MIB                           May 1990


                    ggp(6),
                    hello(7),
                    rip(8),
                    is-is(9),
                    es-is(10),
                    ciscoIgrp(11),
                    bbnSpfIgp(12),
                    oigp(13)
               }

          Definition:
               The routing mechanism via which this route was learned.
               Inclusion of values for gateway routing protocols is not
               intended to imply that hosts should support those
               protocols.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               ipRouteAge { ipRouteEntry 10 }

          Syntax:
               INTEGER

          Definition:
               The number of seconds since this route was last updated
               or otherwise determined to be correct.   Note that no
               semantics of "too old" can be implied except through
               knowledge of the routing protocol by which the route was
               learned.

          Access:
               read-write.

          Status:
               mandatory.









McCloghrie & Rose                                              [Page 42]

RFC 1156                          MIB                           May 1990


5.5.  The ICMP Group

   Implementation of the ICMP group is mandatory for all systems.

   The ICMP group contains the ICMP input and output statistics.

   Note that individual counters for ICMP message (sub-)codes have been
   omitted from this (version of the) MIB for simplicity.


          OBJECT:
          -------
               icmpInMsgs { icmp 1 }

          Syntax:
               Counter

          Definition:
               The total number of ICMP messages which the entity
               received.  Note that this counter includes all those
               counted by icmpInErrors.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInErrors { icmp 2 }

          Syntax:
               Counter

          Definition:
               The number of ICMP messages which the entity received but
               determined as having errors (bad ICMP checksums, bad
               length, etc.).

          Access:
               read-only.

          Status:
               mandatory.





McCloghrie & Rose                                              [Page 43]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
              icmpInDestUnreachs { icmp 3 }

          Syntax:
              Counter

          Definition:
               The number of ICMP Destination Unreachable messages
               received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInTimeExcds { icmp 4 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Time Exceeded messages received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInParmProbs { icmp 5 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Parameter Problem messages received.

          Access:
               read-only.




McCloghrie & Rose                                              [Page 44]

RFC 1156                          MIB                           May 1990


          Status:
               mandatory.


          OBJECT:
          -------
               icmpInSrcQuenchs { icmp 6 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Source Quench messages received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInRedirects { icmp 7 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Redirect messages received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInEchos { icmp 8 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Echo (request) messages received.




McCloghrie & Rose                                              [Page 45]

RFC 1156                          MIB                           May 1990


          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInEchoReps { icmp 9 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Echo Reply messages received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInTimestamps { icmp 10 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Timestamp (request) messages received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInTimestampReps { icmp 11 }

          Syntax:
               Counter




McCloghrie & Rose                                              [Page 46]

RFC 1156                          MIB                           May 1990


          Definition:
               The number of ICMP Timestamp Reply messages received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInAddrMasks { icmp 12 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Address Mask Request messages
               received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpInAddrMaskReps { icmp 13 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Address Mask Reply messages received.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutMsgs { icmp 14 }



McCloghrie & Rose                                              [Page 47]

RFC 1156                          MIB                           May 1990


          Syntax:
               Counter

          Definition:
               The total number of ICMP messages which this entity
               attempted to send.  Note that this counter includes all
               those counted by icmpOutErrors.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutErrors { icmp 15 }

          Syntax:
               Counter

          Definition:
               The number of ICMP messages which this entity did not
               send due to problems discovered within ICMP such as a
               lack of buffers.  This value should not include errors
               discovered outside the ICMP layer such as the inability
               of IP to route the resultant datagram.  In some
               implementations there may be no types of error which
               contribute to this counter's value.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutDestUnreachs { icmp 16 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Destination Unreachable messages sent.




McCloghrie & Rose                                              [Page 48]

RFC 1156                          MIB                           May 1990


          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutTimeExcds { icmp 17 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Time Exceeded messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutParmProbs { icmp 18 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Parameter Problem messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutSrcQuenchs { icmp 19 }

          Syntax:
               Counter




McCloghrie & Rose                                              [Page 49]

RFC 1156                          MIB                           May 1990


          Definition:
               The number of ICMP Source Quench messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutRedirects { icmp 20 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Redirect messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutEchos { icmp 21 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Echo (request) messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutEchoReps { icmp 22 }




McCloghrie & Rose                                              [Page 50]

RFC 1156                          MIB                           May 1990


          Syntax:
               Counter

          Definition:
               The number of ICMP Echo Reply messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutTimestamps { icmp 23 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Timestamp (request) messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutTimestampReps { icmp 24 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Timestamp Reply messages sent.

          Access:
               read-only.

          Status:
               mandatory.






McCloghrie & Rose                                              [Page 51]

RFC 1156                          MIB                           May 1990


          OBJECT:
          -------
               icmpOutAddrMasks { icmp 25 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Address Mask Request messages sent.

          Access:
               read-only.

          Status:
               mandatory.


          OBJECT:
          -------
               icmpOutAddrMaskReps { icmp 26 }

          Syntax:
               Counter

          Definition:
               The number of ICMP Address Mask Reply messages sent.

          Access:
               read-only.

          Status:
               mandatory.



















McCloghrie & Rose                                              [Page 52]

RFC 1156                          MIB                           May 1990


5.6.  The TCP Group

   Implementation of the TCP group is mandatory for all systems
   that implement the TCP protocol.

   Note that instances of object types that represent information
   about a particular TCP connection are transient; they persist
   only as long as the connection in question.

             OBJECT:
             -------
                  tcpRtoAlgorithm { tcp 1 }

             Syntax:
                  INTEGER {
                       other(1),    -- none of the following
                       constant(2), -- a constant rto
                       rsre(3),     -- MIL-STD-1778, Appendix B
                       vanj(4)      -- Van Jacobson's algorithm [15]
                  }

             Definition:
                  The algorithm used to determine the timeout value used
                  for retransmitting unacknowledged octets.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpRtoMin { tcp 2 }

             Syntax:
                  INTEGER

             Definition:
                  The minimum value permitted by a TCP implementation
                  for the retransmission timeout, measured in
                  milliseconds.  More refined semantics for objects
                  of this type depend upon the algorithm used to
                  determine the retransmission timeout.  In particular,
                  when the timeout algorithm is rsre(3), an object
                  of this type has the semantics of the LBOUND
                  quantity described in RFC 793.



McCloghrie & Rose                                              [Page 53]

RFC 1156                          MIB                           May 1990


             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpRtoMax { tcp 3 }

             Syntax:
                  INTEGER

             Definition:
                  The maximum value permitted by a TCP implementation
                  for the retransmission timeout, measured
                  in milliseconds.  More refined semantics for objects
                  of this type depend upon the algorithm used to
                  determine the retransmission timeout.  In particular,
                  when the timeout algorithm is rsre(3), an object of
                  this type has the semantics of the UBOUND quantity
                  described in RFC 793.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpMaxConn { tcp 4 }

             Syntax:
                  INTEGER

             Definition:
                  The limit on the total number of TCP connections the
                  entity can support.  In entities where the maximum
                  number of connections is dynamic, this object should
                  contain the value "-1".

             Access:
                  read-only.





McCloghrie & Rose                                              [Page 54]

RFC 1156                          MIB                           May 1990


             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpActiveOpens { tcp 5 }

             Syntax:
                  Counter

             Definition:
                  The number of times TCP connections have made a direct
                  transition to the SYN-SENT state from the CLOSED
                  state.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpPassiveOpens { tcp 6 }

             Syntax:
                  Counter

             Definition:
                  The number of times TCP connections have made a direct
                  transition to the SYN-RCVD state from the LISTEN
                  state.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpAttemptFails { tcp 7 }

             Syntax:
                  Counter



McCloghrie & Rose                                              [Page 55]

RFC 1156                          MIB                           May 1990


             Definition:
                  The number of times TCP connections have made a direct
                  transition to the CLOSED state from either the
                  SYN-SENT state or the SYN-RCVD state, plus the number
                  of times TCP connections have made a direct transition
                  to the LISTEN state from the SYN-RCVD state.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpEstabResets { tcp 8 }

             Syntax:
                  Counter

             Definition:
                  The number of times TCP connections have made a direct
                  transition to the CLOSED state from either the
                  ESTABLISHED state or the CLOSE-WAIT state.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpCurrEstab { tcp 9 }

             Syntax:
                  Gauge

             Definition:
                  The number of TCP connections for which the current
                  state is either ESTABLISHED or CLOSE-WAIT.

             Access:
                  read-only.





McCloghrie & Rose                                              [Page 56]

RFC 1156                          MIB                           May 1990


             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpInSegs { tcp 10 }

             Syntax:
                  Counter

             Definition:
                  The total number of segments received, including those
                  received in error.  This count includes segments
                  received on currently established connections.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpOutSegs { tcp 11 }

             Syntax:
                  Counter

             Definition:
                  The total number of segments sent, including those on
                  current connections but excluding those containing
                  only retransmitted octets.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpRetransSegs { tcp 12 }

             Syntax:
                  Counter



McCloghrie & Rose                                              [Page 57]

RFC 1156                          MIB                           May 1990


             Definition:
                  The total number of segments retransmitted - that is,
                  the number of TCP segments transmitted containing one
                  or more previously transmitted octets.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpConnTable { tcp 13 }

             Syntax:
                  SEQUENCE OF TcpConnEntry

             Definition:
                  A table containing TCP connection-specific
                  information.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpConnEntry { tcpConnTable 1 }

             Syntax:
                  TcpConnEntry ::= SEQUENCE {
                       tcpConnState
                           INTEGER,
                       tcpConnLocalAddress
                           IpAddress,
                       tcpConnLocalPort
                           INTEGER (0..65535),
                       tcpConnRemAddress
                           IpAddress,
                       tcpConnRemPort
                           INTEGER (0..65535)
                  }




McCloghrie & Rose                                              [Page 58]

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             Definition:
                  Information about a particular current TCP connection.
                  An object of this type is transient, in that it ceases
                  to exist when (or soon after) the connection makes the
                  transition to the CLOSED state.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpConnState { tcpConnEntry 1 }

             Syntax:
                  INTEGER {
                       closed(1),
                       listen(2),
                       synSent(3),
                       synReceived(4),
                       established(5),
                       finWait1(6),
                       finWait2(7),
                       closeWait(8),
                       lastAck(9),
                       closing(10),
                       timeWait(11)
                  }

             Definition:
                  The state of this TCP connection.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpConnLocalAddress { tcpConnEntry 2 }

             Syntax:
                  IpAddress



McCloghrie & Rose                                              [Page 59]

RFC 1156                          MIB                           May 1990


             Definition:
                  The local IP address for this TCP connection.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpConnLocalPort { tcpConnEntry 3 }

             Syntax:
                  INTEGER (0..65535)

             Definition:
                  The local port number for this TCP connection.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpConnRemAddress { tcpConnEntry 4 }

             Syntax:
                  IpAddress

             Definition:
                  The remote IP address for this TCP connection.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  tcpConnRemPort { tcpConnEntry 5 }




McCloghrie & Rose                                              [Page 60]

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             Syntax:
                  INTEGER (0..65535)

             Definition:
                  The remote port number for this TCP connection.

             Access:
                  read-only.

             Status:
                  mandatory.








































McCloghrie & Rose                                              [Page 61]

RFC 1156                          MIB                           May 1990


5.7.  The UDP Group

   Implementation of the UDP group is mandatory for all systems
   which implement the UDP protocol.

             OBJECT:
             -------
                  udpInDatagrams { udp 1 }

             Syntax:
                  Counter

             Definition:
                  The total number of UDP datagrams delivered to UDP
                  users.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  udpNoPorts { udp 2 }

             Syntax:
                  Counter

             Definition:
                  The total number of received UDP datagrams for which
                  there was no application at the destination port.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  udpInErrors { udp 3 }

             Syntax:
                  Counter




McCloghrie & Rose                                              [Page 62]

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             Definition:
                  The number of received UDP datagrams that could not be
                  delivered for reasons other than the lack of an
                  application at the destination port.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  udpOutDatagrams { udp 4 }

             Syntax:
                  Counter

             Definition:
                  The total number of UDP datagrams sent from this
                  entity.

             Access:
                  read-only.

             Status:
                  mandatory.























McCloghrie & Rose                                              [Page 63]

RFC 1156                          MIB                           May 1990


5.8.  The EGP Group

   Implementation of the EGP group is mandatory for all systems
   which implement the EGP protocol.

             OBJECT:
             -------
                  egpInMsgs { egp 1 }

             Syntax:
                  Counter

             Definition:
                  The number of EGP messages received without error.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  egpInErrors { egp 2 }

             Syntax:
                  Counter

             Definition:
                  The number of EGP messages received that proved to be
                  in error.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  egpOutMsgs { egp 3 }

             Syntax:
                  Counter





McCloghrie & Rose                                              [Page 64]

RFC 1156                          MIB                           May 1990


             Definition:
                  The total number of locally generated EGP messages.

             Access:
                  read-only.

             Status:
                  mandatory.


             OBJECT:
             -------
                  egpOutErrors { egp 4 }

             Syntax:
                  Counter

             Definition:
                  The number of locally generated EGP messages not sent
                  due to resource limitations within an EGP entity.

             Access:
                  read-only.

             Status:
                  mandatory.

5.8.1.  The EGP Neighbor Table

   The Egp Neighbor table contains information about this entity's EGP
   neighbors.


             OBJECT:
             -------
                  egpNeighTable { egp 5 }

             Syntax:
                  SEQUENCE OF EgpNeighEntry

             Definition:
                  The EGP neighbor table.

             Access:
                  read-only.

             Status:
                  mandatory.



McCloghrie & Rose                                              [Page 65]

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             OBJECT:
             -------
                  egpNeighEntry { egpNeighTable 1 }

             Syntax:
                  EgpNeighEntry ::= SEQUENCE {
                       egpNeighState
                           INTEGER,
                       egpNeighAddr
                           IpAddress
                  }

             Definition:
                  Information about this entity's relationship with a
                  particular EGP neighbor.

             Access:
                  read-only.

             Status:
                  mandatory.


             We now consider the individual components of each EGP
             neighbor entry:


             OBJECT:
             -------
                  egpNeighState { egpNeighEntry 1 }

             Syntax:
                  INTEGER {
                       idle(1),
                       acquisition(2),
                       down(3),
                       up(4),
                       cease(5)
                  }

             Definition:
                  The EGP state of the local system with respect to this
                  entry's EGP neighbor.  Each EGP state is represented
                  by a value that is one greater than the numerical
                  value associated with said state in RFC 904.

             Access:
                  read-only.



McCloghrie & Rose                                              [Page 66]

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             Status:
                  mandatory.


             OBJECT:
             -------
                  egpNeighAddr { egpNeighEntry 2 }

             Syntax:
                  IpAddress

             Definition:
                  The IP address of this entry's EGP neighbor.

             Access:
                  read-only.

             Status:
                  mandatory.
































McCloghrie & Rose                                              [Page 67]

RFC 1156                          MIB                           May 1990


6.  Definitions

                RFC1156-MIB

                DEFINITIONS ::= BEGIN

                IMPORTS
                        mgmt, OBJECT-TYPE, NetworkAddress, IpAddress,
                        Counter, Gauge, TimeTicks
                            FROM RFC1155-SMI;

                  mib        OBJECT IDENTIFIER ::= { mgmt 1 }

                  system     OBJECT IDENTIFIER ::= { mib 1 }
                  interfaces OBJECT IDENTIFIER ::= { mib 2 }
                  at         OBJECT IDENTIFIER ::= { mib 3 }
                  ip         OBJECT IDENTIFIER ::= { mib 4 }
                  icmp       OBJECT IDENTIFIER ::= { mib 5 }
                  tcp        OBJECT IDENTIFIER ::= { mib 6 }
                  udp        OBJECT IDENTIFIER ::= { mib 7 }
                  egp        OBJECT IDENTIFIER ::= { mib 8 }

                  -- object types

                  -- the System group

                  sysDescr OBJECT-TYPE
                          SYNTAX  OCTET STRING
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { system 1 }

                  sysObjectID OBJECT-TYPE
                          SYNTAX  OBJECT IDENTIFIER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { system 2 }

                  sysUpTime OBJECT-TYPE
                          SYNTAX  TimeTicks
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { system 3 }

                  -- the Interfaces group

                  ifNumber OBJECT-TYPE
                          SYNTAX  INTEGER



McCloghrie & Rose                                              [Page 68]

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                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { interfaces 1 }

                  -- the Interfaces table

                  ifTable OBJECT-TYPE
                          SYNTAX  SEQUENCE OF IfEntry
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { interfaces 2 }

                  ifEntry OBJECT-TYPE
                          SYNTAX  IfEntry
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ifTable 1 }

                  IfEntry ::= SEQUENCE {
                      ifIndex
                          INTEGER,
                      ifDescr
                          OCTET STRING,
                      ifType
                          INTEGER,
                      ifMtu
                          INTEGER,
                      ifSpeed
                          Gauge,
                      ifPhysAddress
                          OCTET STRING,
                      ifAdminStatus
                          INTEGER,
                      ifOperStatus
                          INTEGER,
                      ifLastChange
                          TimeTicks,
                      ifInOctets
                          Counter,
                      ifInUcastPkts
                          Counter,
                      ifInNUcastPkts
                          Counter,
                      ifInDiscards
                          Counter,
                      ifInErrors
                          Counter,
                      ifInUnknownProtos



McCloghrie & Rose                                              [Page 69]

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                          Counter,
                      ifOutOctets
                          Counter,
                      ifOutUcastPkts
                          Counter,
                      ifOutNUcastPkts
                          Counter,
                      ifOutDiscards
                          Counter,
                      ifOutErrors
                          Counter,
                      ifOutQLen
                          Gauge
                  }

                  ifIndex OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 1 }

                  ifDescr OBJECT-TYPE
                          SYNTAX  OCTET STRING
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 2 }

                  ifType OBJECT-TYPE
                          SYNTAX  INTEGER {
                                  other(1),     -- none of the following
                                  regular1822(2),
                                  hdh1822(3),
                                  ddn-x25(4),
                                  rfc877-x25(5),
                                  ethernet-csmacd(6),
                                  iso88023-csmacd(7),
                                  iso88024-tokenBus(8),
                                  iso88025-tokenRing(9),
                                  iso88026-man(10),
                                  starLan(11),
                                  proteon-10MBit(12),
                                  proteon-80MBit(13),
                                  hyperchannel(14),
                                  fddi(15),
                                  lapb(16),
                                  sdlc(17),
                                  t1-carrier(18),
                                  cept(19),



McCloghrie & Rose                                              [Page 70]

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                                  basicIsdn(20),
                                  primaryIsdn(21),
                                                   -- proprietary serial
                                  propPointToPointSerial(22)
                              }
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 3 }

                  ifMtu OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 4 }

                  ifSpeed OBJECT-TYPE
                          SYNTAX  Gauge
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 5 }

                  ifPhysAddress OBJECT-TYPE
                          SYNTAX  OCTET STRING
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 6 }

                  ifAdminStatus OBJECT-TYPE
                          SYNTAX  INTEGER {
                                  up(1),        -- ready to pass packets
                                  down(2),
                                  testing(3)    -- in some test mode
                                  }
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ifEntry 7 }

                  ifOperStatus OBJECT-TYPE
                          SYNTAX  INTEGER {
                                  up(1),        -- ready to pass packets
                                  down(2),
                                  testing(3)    -- in some test mode
                                  }
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 8 }

                  ifLastChange OBJECT-TYPE



McCloghrie & Rose                                              [Page 71]

RFC 1156                          MIB                           May 1990


                          SYNTAX  TimeTicks
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 9 }

                  ifInOctets OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 10 }

                  ifInUcastPkts OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::=  { ifEntry 11 }

                  ifInNUcastPkts OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 12 }

                  ifInDiscards OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 13 }

                  ifInErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 14 }

                  ifInUnknownProtos OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 15 }

                  ifOutOctets OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 16 }

                  ifOutUcastPkts OBJECT-TYPE



McCloghrie & Rose                                              [Page 72]

RFC 1156                          MIB                           May 1990


                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 17 }

                  ifOutNUcastPkts OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 18 }

                  ifOutDiscards OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 19 }

                  ifOutErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 20 }

                  ifOutQLen OBJECT-TYPE
                          SYNTAX  Gauge
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ifEntry 21 }

                  -- the Address Translation group

                  atTable OBJECT-TYPE
                          SYNTAX  SEQUENCE OF AtEntry
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { at 1 }

                  atEntry OBJECT-TYPE
                          SYNTAX  AtEntry
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { atTable 1 }

                  AtEntry ::= SEQUENCE {
                      atIfIndex
                          INTEGER,
                      atPhysAddress
                          OCTET STRING,



McCloghrie & Rose                                              [Page 73]

RFC 1156                          MIB                           May 1990


                      atNetAddress
                          NetworkAddress
                  }

                  atIfIndex OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { atEntry 1 }

                  atPhysAddress OBJECT-TYPE
                          SYNTAX  OCTET STRING
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { atEntry 2 }

                  atNetAddress OBJECT-TYPE
                          SYNTAX  NetworkAddress
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { atEntry 3 }

                  -- the IP group

                  ipForwarding OBJECT-TYPE
                          SYNTAX  INTEGER {
                        gateway(1), -- entity forwards datagrams
                        host(2)     -- entity does NOT forward datagrams
                                  }
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 1 }

                  ipDefaultTTL OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ip 2 }

                  ipInReceives OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 3 }

                  ipInHdrErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only



McCloghrie & Rose                                              [Page 74]

RFC 1156                          MIB                           May 1990


                          STATUS  mandatory
                          ::= { ip 4 }

                  ipInAddrErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 5 }

                  ipForwDatagrams OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 6 }

                  ipInUnknownProtos OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 7 }

                  ipInDiscards OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 8 }

                  ipInDelivers OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 9 }

                  ipOutRequests OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 10 }

                  ipOutDiscards OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 11 }

                  ipOutNoRoutes OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only



McCloghrie & Rose                                              [Page 75]

RFC 1156                          MIB                           May 1990


                          STATUS  mandatory
                          ::= { ip 12 }

                  ipReasmTimeout OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 13 }

                  ipReasmReqds OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 14 }

                  ipReasmOKs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 15 }

                  ipReasmFails OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 16 }

                  ipFragOKs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 17 }

                  ipFragFails OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 18 }

                  ipFragCreates OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 19 }

                  -- the IP Interface table

                  ipAddrTable OBJECT-TYPE



McCloghrie & Rose                                              [Page 76]

RFC 1156                          MIB                           May 1990


                          SYNTAX  SEQUENCE OF IpAddrEntry
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ip 20 }

                  ipAddrEntry OBJECT-TYPE
                          SYNTAX  IpAddrEntry
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ipAddrTable 1 }

                  IpAddrEntry ::= SEQUENCE {
                      ipAdEntAddr
                          IpAddress,
                      ipAdEntIfIndex
                          INTEGER,
                      ipAdEntNetMask
                          IpAddress,
                      ipAdEntBcastAddr
                          INTEGER
                  }

                  ipAdEntAddr OBJECT-TYPE
                          SYNTAX  IpAddress
                          ACCESS  read-only
                          STATUS  mandatory
                          ::=  { ipAddrEntry 1 }

                  ipAdEntIfIndex OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::=  { ipAddrEntry 2 }

                  ipAdEntNetMask OBJECT-TYPE
                          SYNTAX  IpAddress
                          ACCESS  read-only
                          STATUS  mandatory
                          ::=  { ipAddrEntry 3 }

                  ipAdEntBcastAddr OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ipAddrEntry 4 }






McCloghrie & Rose                                              [Page 77]

RFC 1156                          MIB                           May 1990


                  -- the IP Routing table

                  ipRoutingTable OBJECT-TYPE
                          SYNTAX  SEQUENCE OF IpRouteEntry
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ip 21 }

                  ipRouteEntry OBJECT-TYPE
                          SYNTAX  IpRouteEntry
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRoutingTable 1 }

                  IpRouteEntry ::= SEQUENCE {
                      ipRouteDest
                          IpAddress,
                      ipRouteIfIndex
                          INTEGER,
                      ipRouteMetric1
                          INTEGER,
                      ipRouteMetric2
                          INTEGER,
                      ipRouteMetric3
                          INTEGER,
                      ipRouteMetric4
                          INTEGER,
                      ipRouteNextHop
                          IpAddress,
                      ipRouteType
                          INTEGER,
                      ipRouteProto
                          INTEGER,
                      ipRouteAge
                          INTEGER
                  }

                  ipRouteDest OBJECT-TYPE
                          SYNTAX  IpAddress
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 1 }

                  ipRouteIfIndex  OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 2 }



McCloghrie & Rose                                              [Page 78]

RFC 1156                          MIB                           May 1990


                  ipRouteMetric1 OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 3 }

                  ipRouteMetric2 OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 4 }

                  ipRouteMetric3 OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 5 }

                  ipRouteMetric4 OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 6 }

                  ipRouteNextHop OBJECT-TYPE
                          SYNTAX  IpAddress
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 7 }

                  ipRouteType OBJECT-TYPE
                          SYNTAX  INTEGER {
                            other(1),      -- none of the following

                            invalid(2),    -- an invalidated route

                                           -- route to directly
                            direct(3),     -- connected (sub-)network

                                           -- route to a non-local
                            remote(4),     -- host/network/sub-network
                              }
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 8 }

                  ipRouteProto OBJECT-TYPE
                          SYNTAX  INTEGER {



McCloghrie & Rose                                              [Page 79]

RFC 1156                          MIB                           May 1990


                            other(1),     -- none of the following

                                          -- non-protocol information
                                          --   e.g., manually
                            local(2),     --   configured entries

                                          -- set via a network
                            netmgmt(3),   --   management protocol

                                          -- obtained via ICMP,
                            icmp(4),      --   e.g., Redirect

                                          -- the following are
                                          -- gateway routing protocols
                            egp(5),
                            ggp(6),
                            hello(7),
                            rip(8),
                            is-is(9),
                            es-is(10),
                            ciscoIgrp(11),
                            bbnSpfIgp(12),
                            oigp(13)
                              }
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { ipRouteEntry 9 }

                  ipRouteAge OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-write
                          STATUS  mandatory
                          ::= { ipRouteEntry 10 }

                  -- the ICMP group

                  icmpInMsgs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 1 }

                  icmpInErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 2 }




McCloghrie & Rose                                              [Page 80]

RFC 1156                          MIB                           May 1990


                  icmpInDestUnreachs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 3 }

                  icmpInTimeExcds OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 4 }

                  icmpInParmProbs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 5 }

                  icmpInSrcQuenchs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 6 }

                  icmpInRedirects OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 7 }

                  icmpInEchos OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 8 }

                  icmpInEchoReps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 9 }

                  icmpInTimestamps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 10 }




McCloghrie & Rose                                              [Page 81]

RFC 1156                          MIB                           May 1990


                  icmpInTimestampReps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 11 }

                  icmpInAddrMasks OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 12 }

                  icmpInAddrMaskReps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 13 }

                  icmpOutMsgs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 14 }

                  icmpOutErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 15 }

                  icmpOutDestUnreachs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 16 }

                  icmpOutTimeExcds OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 17 }

                  icmpOutParmProbs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 18 }




McCloghrie & Rose                                              [Page 82]

RFC 1156                          MIB                           May 1990


                  icmpOutSrcQuenchs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 19 }

                  icmpOutRedirects OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 20 }

                  icmpOutEchos OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 21 }

                  icmpOutEchoReps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 22 }

                  icmpOutTimestamps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 23 }

                  icmpOutTimestampReps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 24 }

                  icmpOutAddrMasks OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 25 }

                  icmpOutAddrMaskReps OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { icmp 26 }




McCloghrie & Rose                                              [Page 83]

RFC 1156                          MIB                           May 1990


                  -- the TCP group

                  tcpRtoAlgorithm OBJECT-TYPE
                          SYNTAX  INTEGER {
                          other(1),    -- none of the following
                          constant(2), -- a constant rto
                          rsre(3),     -- MIL-STD-1778, Appendix B
                          vanj(4)      -- Van Jacobson's algorithm [15]
                                  }
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 1 }

                  tcpRtoMin OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 2 }

                  tcpRtoMax OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 3 }

                  tcpMaxConn OBJECT-TYPE
                          SYNTAX  INTEGER
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 4 }

                  tcpActiveOpens OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 5 }

                  tcpPassiveOpens OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 6 }

                  tcpAttemptFails OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 7 }



McCloghrie & Rose                                              [Page 84]

RFC 1156                          MIB                           May 1990


                  tcpEstabResets OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 8 }

                  tcpCurrEstab OBJECT-TYPE
                          SYNTAX  Gauge
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 9 }

                  tcpInSegs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 10 }

                  tcpOutSegs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 11 }

                  tcpRetransSegs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 12 }

                  -- the TCP connections table

                  tcpConnTable OBJECT-TYPE
                          SYNTAX  SEQUENCE OF TcpConnEntry
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcp 13 }

                  tcpConnEntry OBJECT-TYPE
                          SYNTAX  TcpConnEntry
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcpConnTable 1 }

                  TcpConnEntry ::= SEQUENCE {
                      tcpConnState
                          INTEGER,
                      tcpConnLocalAddress



McCloghrie & Rose                                              [Page 85]

RFC 1156                          MIB                           May 1990


                          IpAddress,
                      tcpConnLocalPort
                          INTEGER (0..65535),
                      tcpConnRemAddress
                          IpAddress,
                      tcpConnRemPort
                          INTEGER (0..65535)
                  }

                  tcpConnState OBJECT-TYPE
                          SYNTAX  INTEGER {
                                      closed(1),
                                      listen(2),
                                      synSent(3),
                                      synReceived(4),
                                      established(5),
                                      finWait1(6),
                                      finWait2(7),
                                      closeWait(8),
                                      lastAck(9),
                                      closing(10),
                                      timeWait(11)
                                  }
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcpConnEntry 1 }

                  tcpConnLocalAddress OBJECT-TYPE
                          SYNTAX  IpAddress
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcpConnEntry 2 }

                  tcpConnLocalPort OBJECT-TYPE
                          SYNTAX  INTEGER (0..65535)
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcpConnEntry 3 }

                  tcpConnRemAddress OBJECT-TYPE
                          SYNTAX  IpAddress
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { tcpConnEntry 4 }

                  tcpConnRemPort OBJECT-TYPE
                          SYNTAX  INTEGER (0..65535)
                          ACCESS  read-only



McCloghrie & Rose                                              [Page 86]

RFC 1156                          MIB                           May 1990


                          STATUS  mandatory
                          ::= { tcpConnEntry 5 }

                  -- the UDP group

                  udpInDatagrams OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { udp 1 }

                  udpNoPorts OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { udp 2 }

                  udpInErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { udp 3 }

                  udpOutDatagrams OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { udp 4 }

                  -- the EGP group

                  egpInMsgs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egp 1 }

                  egpInErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egp 2 }

                  egpOutMsgs OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egp 3 }



McCloghrie & Rose                                              [Page 87]

RFC 1156                          MIB                           May 1990


                  egpOutErrors OBJECT-TYPE
                          SYNTAX  Counter
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egp 4 }

                  -- the EGP Neighbor table

                  egpNeighTable OBJECT-TYPE
                          SYNTAX  SEQUENCE OF EgpNeighEntry
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egp 5 }

                  egpNeighEntry OBJECT-TYPE
                          SYNTAX  EgpNeighEntry
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egpNeighTable 1 }

                  EgpNeighEntry ::= SEQUENCE {
                      egpNeighState
                          INTEGER,
                      egpNeighAddr
                          IpAddress
                  }

                  egpNeighState OBJECT-TYPE
                          SYNTAX  INTEGER {
                                      idle(1),
                                      acquisition(2),
                                      down(3),
                                      up(4),
                                      cease(5)
                                  }
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egpNeighEntry 1 }

                  egpNeighAddr OBJECT-TYPE
                          SYNTAX  IpAddress
                          ACCESS  read-only
                          STATUS  mandatory
                          ::= { egpNeighEntry 2 }

                  END





McCloghrie & Rose                                              [Page 88]

RFC 1156                          MIB                           May 1990


7.  Acknowledgements

   The initial draft of this memo was heavily influenced by the the HEMS
   [9] and SNMP [10] MIBs.

   Its final form is the result of the suggestions, the dicussions, and
   the compromises reached by the members of the IETF MIB working group:

         Karl Auerbach, Epilogue Technology
         K. Ramesh Babu, Excelan
         Lawrence Besaw, Hewlett-Packard
         Jeffrey D. Case, University of Tennessee at Knoxville
         James R. Davin, Proteon
         Mark S. Fedor, NYSERNet
         Robb Foster, BBN
         Phill Gross, The MITRE Corporation
         Bent Torp Jensen, Convergent Technology
         Lee Labarre, The MITRE Corporation
         Dan Lynch, Advanced Computing Environments
         Keith McCloghrie, The Wollongong Group
         Dave Mackie, 3Com/Bridge
         Craig Partridge, BBN (chair)
         Jim Robertson, 3Com/Bridge
         Marshall T. Rose, The Wollongong Group
         Greg Satz, cisco
         Martin Lee Schoffstall, Rensselaer Polytechnic Institute
         Lou Steinberg, IBM
         Dean Throop, Data General
         Unni Warrier, Unisys






















McCloghrie & Rose                                              [Page 89]

RFC 1156                          MIB                           May 1990


8.  References

   [1]  Cerf, V., "IAB Recommendations for the Development of Internet
        Network Management Standards", RFC 1052, IAB, April 1988.

   [2]  Information processing systems - Open Systems Interconnection,
        "Management Information Services Definition", International
        Organization for Standardization, Draft Proposal 9595/2,
        December 1987.

   [3]  Information processing systems - Open Systems Interconnection,
        "Management Information Protocol Specification", International
        Organization for Standardization, Draft Proposal 9596/2,
        December 1987.

   [4]  Rose M., and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based internets", RFC 1065,
        TWG, August 1988.

   [5]  Partridge C., and G. Trewitt, "The High-Level Entity Management
        System (HEMS)", RFCs 1021-1024, BBN and Stanford, October 1987.

   [6]  Cerf, V., "Report of the Second Ad Hoc Network Management Review
        Group", RFC 1109, IAB, August 1989.

   [7]  Rose, M., and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based Internets", RFC 1155,
        Performance Systems International and Hughes LAN Systems, May
        1990.

   [8]  Case, J., M. Fedor, M. Schoffstall, and J. Davin, The Simple
        Network Management Protocol", RFC 1157, University of Tennessee
        at Knoxville, Performance Systems International, Performance
        Systems International, and the MIT Laboratory for Computer
        Science, May 1990.

   [9]  Partridge C., and G. Trewitt, "HEMS Variable Definitions", RFC
        1024, BBN and Stanford, October 1987.

  [10]  Case, J., M. Fedor, M. Schoffstall, and J. Davin, "A Simple
        Network Management Protocol", RFC 1067, University of Tennessee
        At Knoxville, NYSERNet, Rensselaer Polytechnic, Proteon, August
        1988.

  [11]  LaBarre, L., "Structure and Identification of Management
        Information for the Internet", Internet Engineering Task Force
        working note, Network Information Center, SRI International,
        Menlo Park, California, April 1988.



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RFC 1156                          MIB                           May 1990


  [12]  LaBarre, L., "Transport Layer Management Information:  TCP",
        Internet Engineering Task Force working note in preparation.
        Network Information Center, SRI International, Menlo Park,
        California, (unpublished).

  [13]  Information processing systems - Open Systems Interconnection,
        "Specification of Abstract Syntax Notation One (ASN.1)",
        International Organization for Standardization, International
        Standard 8824, December 1987.

  [14]  Information processing systems - Open Systems Interconnection,
        "Specification of Basic Encoding Rules for Abstract Notation One
        (ASN.1)", International Organization for Standardization,
        International Standard 8825, December 1987.

  [15]  Jacobson, V., "Congestion Avoidance and Control", SIGCOMM, 1988,
        Stanford, California.

Security Considerations

   Security issues are not discussed in this memo.

Authors' Addresses

   Keith McCloghrie
   The Wollongong Group
   1129 San Antonio Road
   Palo Alto, CA 04303

   Phone: (415) 962-7160

   EMail: sytek!kzm@HPLABS.HP.COM


   Marshall T. Rose
   PSI, Inc.
   PSI California Office
   P.O. Box 391776
   Mountain View, CA 94039

   Phone: (415) 961-3380

   EMail: mrose@PSI.COM








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