Transmission Control Protocol (TCP) Parameters

Last Updated

2024-12-06

Available Formats

XML
HTML
Plain text

Registries included below

• TCP Option Kind Numbers
• TCP Alternate Checksum Numbers
• Cryptographic Algorithms for TCP-AO Registration
• MPTCP Option Subtypes
• MPTCP Handshake Algorithms
• TCP Experimental Option Experiment Identifiers (TCP ExIDs)
• TCP Encryption Protocol Identifiers
• tcpcrypt AEAD Algorithms
• MPTCP MP_TCPRST Reason Codes
• TCP Header Flags

TCP Option Kind Numbers

Registration Procedure(s)

Standards Action or IESG Approval

Reference

[RFC2780]

Note

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.

[*] It is only appropriate to use these values in explicitly-
    configured experiments; they MUST NOT be shipped as defaults in
    implementations.  See [RFC3692] for details.
    
[**] These values have been deployed in the Internet without proper
    IANA assignment. At some point, these numbers may be officially
    allocated for some new purpose. It is therefore strongly recommended
    that implementers migrate to mechanisms with IANA-assigned values to
    avoid potential issues with their systems or products at a later point.

[***] This value has been deployed on the Internet in ways that are 
    not compatible with the documented use in this IANA allocation. 

    

Note

Values 16-18 were assigned before October 1994 (see [RFC1700]), and 
values 20-26 were assigned between Feb 9, 1999 and May 10, 2000. No 
further documentation is available.
    

Available Formats

CSV

TCP Alternate Checksum Numbers

Registration Procedure(s)

Not defined

Reference

[RFC1146]

Available Formats

CSV

Cryptographic Algorithms for TCP-AO Registration

Registration Procedure(s)

RFC Publication After Expert Review

Reference

[RFC5926]

Available Formats

CSV

MPTCP Option Subtypes

Registration Procedure(s)

Standards Action

Reference

[RFC8684]

Note

This registry specifies the MPTCP Option Subtypes for MPTCP v1,
which obsoletes the Experimental MPTCP v0.  For the MPTCP v0
subtypes, please refer to [RFC6824].

Available Formats

CSV

MPTCP Handshake Algorithms

Registration Procedure(s)

Standards Action

Reference

[RFC8684]

Note

This registry specifies the MPTCP Handshake Algorithms for
MPTCP v1, which obsoletes the Experimental MPTCP v0.  For the MPTCP
v0 subtypes, please refer to [RFC6824].

Available Formats

CSV

TCP Experimental Option Experiment Identifiers (TCP ExIDs)

Registration Procedure(s)

First Come First Served

Reference

[RFC6994]

Note

IANA will record known duplicate uses.
      
    

Available Formats

CSV

TCP Encryption Protocol Identifiers

Registration Procedure(s)

IETF Review or Expert Review with RFC Required

Expert(s)

Unassigned

Reference

[RFC8547]

Available Formats

CSV

tcpcrypt AEAD Algorithms

Registration Procedure(s)

IETF Review or Expert Review with RFC Required

Expert(s)

Unassigned

Reference

[RFC8548]

Available Formats

CSV

MPTCP MP_TCPRST Reason Codes

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

[RFC8684]

Available Formats

CSV

TCP Header Flags

Registration Procedure(s)

Standards Action

Reference

[RFC9293]

Available Formats

CSV

Contact Information

Footnotes

[https://devcentral.f5.com/tech-tips/articles/accessing-tcp-options-from-irules]

current and new TCP-ENO implementations MUST use TCP option kind 69.