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TCP OPTION NUMBERS
The Transmission Control Protocol (TCP) has provision for optional
header fields identified by an option kind field. Options 0 and 1 are
exactly one octet which is their kind field. All other options have
their one octet kind field, followed by a one octet length field,
followed by length-2 octets of option data.
Kind Length Meaning Reference
---- ------ ------------------------------- ---------
0 - End of Option List [RFC793]
1 - No-Operation [RFC793]
2 4 Maximum Segment Size [RFC793]
3 3 WSOPT - Window Scale [RFC1323]
4 2 SACK Permitted [RFC2018]
5 N SACK [RFC2018]
6 6 Echo (obsoleted by option 8) [RFC1072]
7 6 Echo Reply (obsoleted by option 8)[RFC1072]
8 10 TSOPT - Time Stamp Option [RFC1323]
9 2 Partial Order Connection Permitted[RFC1693]
10 3 Partial Order Service Profile [RFC1693]
11 CC [RFC1644]
12 CC.NEW [RFC1644]
13 CC.ECHO [RFC1644]
14 3 TCP Alternate Checksum Request [RFC1146]
15 N TCP Alternate Checksum Data [RFC1146]
16 Skeeter [Knowles]
17 Bubba [Knowles]
18 3 Trailer Checksum Option [Subbu & Monroe]
19 18 MD5 Signature Option [RFC2385]
20 SCPS Capabilities [Scott]
21 Selective Negative Acknowledgements [Scott]
22 Record Boundaries [Scott]
23 Corruption experienced [Scott]
24 SNAP [Sukonnik]
25 Unassigned (released 12/18/00)
26 TCP Compression Filter [Bellovin]
TCP ALTERNATE CHECKSUM NUMBERS
Number Description Reference
------- ------------------------------- ----------
0 TCP Checksum [RFC-1146]
1 8-bit Fletchers's algorithm [RFC-1146]
2 16-bit Fletchers's algorithm [RFC-1146]
3 Redundant Checksum Avoidance [Kay]
REFERENCES
----------
[KAY] Kay, J. and Pasquale, J., "Measurement, Analysis, and
Improvement of UDP/IP Throughput for the DECstation 5000,"
Proceedings of the Winter 1993 Usenix Conference, January 1993
(available for anonymous FTP in
ucsd.edu:/pub/csl/fastnet/fastnet.tar.Z). <jkay@ucsd.edu>
[RFC793] Postel, J., "Transmission Control Protocol - DARPA Internet
Program Protocol Specification", STD 7, RFC 793, DARPA,
September 1981.
[RFC1323] Jacobson, V., Braden, R., and D. Borman, "TCP Extensions for
High Performance", RFC 1323, LBL, ISI, Cray Research, May
1992.
[RFC1072] Jacobson, V., and R. Braden, "TCP Extensions for Long-Delay
Paths", RFC 1072, LBL, ISI, October 1988.
[RFC1644] Braden, R. "T/TCP -- TCP Extensions for Transactions
Functional Specification", RFC 1644, ISI, July 1994
[RFC1693] Connolly, T., et al, "An Extension to TCP : Partial Order
Service", RFC 1693, University of Deleware, November 1994.
[RFC1146] Zweig, J., and C. Partridge, "TCP Alternate Checksum
Options", RFC 1146, UIUC, BBN, March 1990.
[RFC2018] Mathis, M., Mahdavi, J., Floyd, S., and Romanow, A., TCP
Selective Acknowledgement Options. RFC 2018, April 1996.
[RFC2385] Heffernan, A., "Protection of BGP Sessions via the TCP MD5
Signature Option", RFC 2385, Cisco Systems, August 1998.
PEOPLE
------
[Bellovin] Steve Bellovin, <smb@research.att.com>, March 2000.
[Braden] Bob Braden, <braden@isi.edu>, March 1995.
[Bridges] Monroe Bridges, <monroe@cup.hp.com>, September 1994.
[Knowles] Stev Knowles, <stev@ftp.com>, March 1995.
[Kay] J. Kay, <jkay@ucsd.edu>, Septermber 1994.
[Scott] Keith Scott <kscott@mitre.org>, February 1999.
[Subbu] Subbu Subramaniam, <subbu@cup.hp.com>, September 1994.
[Sukonnik] Vladimir Sukonnik <vladimir@sitaranetworks.com>, February 1999.
(last updated May 01 2001)
[]
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