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TCP Maintenance and Minor Extensions (tcpm)

WG Name TCP Maintenance and Minor Extensions
Acronym tcpm
Area Web and Internet Transport (wit)
State Active
Charter charter-ietf-tcpm-10 Approved
Status update Show Changed 2020-07-23
Document dependencies
Additional resources Issue tracker, Wiki, Zulip Stream
Personnel Chairs Ian Swett, Michael Tüxen, Yoshifumi Nishida
Area Director Zaheduzzaman Sarker
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Charter for Working Group

TCP is currently one of the Internet's predominant transport protocols. TCPM
is the working group within the IETF that handles small TCP changes,
i.e., minor extensions to TCP algorithms and protocol mechanisms.
The TCPM WG serves several purposes:

  • The WG mostly focuses on maintenance issues (e.g., bug fixes) and
    modest changes to the protocol, algorithms, and interfaces that
    maintain TCP's utility.

  • The WG is a venue for moving current TCP specifications along the
    standards track.

  • The WG maintains Multipath TCP (MPTCP) and is a home for minor
    MPTCP enhancements including updates to the existing multipath
    congestion control.

The preferred venue for Congestion control work is generally CCWG or ICCRG. However, TCPM can take on such work in coordination with those groups, especially if it relies on TCP-specific protocol elements.

New TCPM milestones that fall within the scope specified within the
charter can be added after consensus on acceptance in the working
group and approval by the responsible Area Director.


Date Milestone Associated documents
Oct 2024 Submit document on adding acknowledgement rate handling for TCP to the IESG for publication as Experimental RFC draft-ietf-tcpm-ack-rate-request
Dec 2023 Submit document on a TCP Extended Data Offset Option to the IESG as a Proposed Standard RFC draft-ietf-tcpm-tcp-edo
Jan 2023 Submit document on adding Explicit Congestion Notification (ECN) to TCP Control Packets to the IESG for publication as Experimental RFC draft-ietf-tcpm-generalized-ecn
Dec 2022 Submit specification of more accurate ECN feedback in TCP to the IESG for publication as a Proposed Standard RFC draft-ietf-tcpm-accurate-ecn
Nov 2022 Submit RFC6937bis document to the IESG for publication as a Proposed Standard RFC draft-ietf-tcpm-prr-rfc6937bis