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 Meaning Reference
---- ------------------------------- ---------
0 End of Option List [RFC793]
1 No-Operation [RFC793]
2 Maximum Segment Size [RFC793]
3 WSOPT - Window Scale [RFC1323]
4 SACK Permitted [RFC2018]
5 SACK [RFC2018]
6 Echo (obsoleted by option 8) [RFC1072]
7 Echo Reply (obsoleted by option 8)[RFC1072]
8 TSOPT - Time Stamp Option [RFC1323]
9 Partial Order Connection Permitted[RFC1693]
10 Partial Order Service Profile [RFC1693]
11 CC [RFC1644]
12 CC.NEW [RFC1644]
13 CC.ECHO [RFC1644]
14 TCP Alternate Checksum Request [RFC1146]
15 TCP Alternate Checksum Data [RFC1146]
16 Skeeter [Knowles]
17 Bubba [Knowles]
18 Trailer Checksum Option [Subbu & Monroe]
19 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] |
发表于 2006-4-30 10:53:47