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<pre>Network Working Group K. Sarcar
Request for Comments: 3827 Sun Microsystems, Inc.
Category: Informational June 2004
<span class="h1">Additional Snoop Datalink Types</span>
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
The snoop file format provides a way to store and exchange datalink
layer packet traces. This document describes extensions to this file
format to support new media.
<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Introduction</span>
[<a id="ref-RFC1761">RFC1761</a>] defines the snoop file format used to store captured
network packets for tools that capture, display, and interpret
network traffic. The file format specifies a header containing the
Datalink Type field that identifies the network's datalink type.
This document defines new values for this field, as well as an IANA
registry for future datalink types.
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. New Datalink Types</span>
In addition to the Datalink Type codes listed in [<a href="./rfc1761" title=""Snoop Version 2 Packet Capture File Format"">RFC1761</a>], this
document defines the following type codes for the corresponding
media:
Datalink Type Code
------------- ----
Fibre Channel 16
ATM 17
ATM Classical IP 18
IP over Infiniband 26
The IP over Infiniband packet format is described in [<a href="#ref-IPoIB" title=""IP encapsulation and address resolution over InfiniBand networks"">IPoIB</a>].
<span class="grey">Sarcar Informational [Page 1]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-2" ></span>
<span class="grey"><a href="./rfc3827">RFC 3827</a> Additional Snoop Datalink Types June 2004</span>
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. IANA Considerations</span>
This document created a new IANA registry named "Snoop Datalink
Types" to hold the various possible 32-bit (4 octet) snoop datalink
types. This new registry holds the values previously defined in
[<a href="./rfc1761" title=""Snoop Version 2 Packet Capture File Format"">RFC1761</a>] and tabulated below:
Datalink Type Code
------------- ----
IEEE 802.3 0
IEEE 802.4 Token Bus 1
IEEE 802.5 Token Ring 2
IEEE 802.6 Metro Net 3
Ethernet 4
HDLC 5
Character Synchronous 6
IBM Channel-to-Channel 7
FDDI 8
Other 9
Additionally, the new registry also holds the values defined above in
<a href="#section-2">section 2</a> of this document.
All new allocations and assignments to this registry starting from
code 27 will follow the First Come First Served policy outlined in
[<a href="#ref-BCP0026" title="">BCP0026</a>]. Type codes up to 26 not defined by this section of the
document (10-15 and 19-25) are considered reserved.
<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. Security Considerations</span>
The addition of new datalink type codes to the existing file format
poses no known security risks.
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. Acknowledgements</span>
The author would like to thank Jim Carlson, Brent Callaghan, and Bill
Strahm for meticulously reviewing this document.
<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>. References</span>
<span class="h3"><a class="selflink" id="section-6.1" href="#section-6.1">6.1</a>. Normative References</span>
[<a id="ref-RFC1761">RFC1761</a>] Callaghan, B. and R. Gilligan, "Snoop Version 2 Packet
Capture File Format", <a href="./rfc1761">RFC 1761</a>, February 1995.
<span class="grey">Sarcar Informational [Page 2]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-3" ></span>
<span class="grey"><a href="./rfc3827">RFC 3827</a> Additional Snoop Datalink Types June 2004</span>
[<a id="ref-BCP0026">BCP0026</a>] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", <a href="https://www.rfc-editor.org/bcp/bcp26">BCP 26</a>, <a href="./rfc2434">RFC 2434</a>,
October 1998.
<span class="h3"><a class="selflink" id="section-6.2" href="#section-6.2">6.2</a>. Informative References</span>
[<a id="ref-IPoIB">IPoIB</a>] Kashyap, V. and H.K. Chu, "IP encapsulation and address
resolution over InfiniBand networks", Work in Progress,
April 2003.
<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>. Author's Address</span>
Kanoj Sarcar
Sun Microsystems, Inc.
14 Network Circle
Bldg 14, MPK14-333
Menlo Park, CA 94025
Phone: 1-650-786-4785
EMail: kanoj.sarcar@sun.com
<span class="grey">Sarcar Informational [Page 3]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-4" ></span>
<span class="grey"><a href="./rfc3827">RFC 3827</a> Additional Snoop Datalink Types June 2004</span>
<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>. Full Copyright Statement</span>
Copyright (C) The Internet Society (2004). This document is subject
to the rights, licenses and restrictions contained in <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a>, and
except as set forth therein, the authors retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Intellectual Property
The IETF takes no position regarding the validity or scope of any
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this document or the extent to which any license under such rights
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Sarcar Informational [Page 4]
</pre>
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