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TCP Extended Data Offset Option

Document Type Expired Internet-Draft (tcpm WG)
Expired & archived
Authors Dr. Joseph D. Touch , Wesley Eddy
Last updated 2023-04-25 (Latest revision 2022-10-22)
Replaces draft-touch-tcpm-tcp-edo
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Additional resources Mailing list discussion
Stream WG state WG Document
Associated WG milestone
Dec 2023
Submit document on a TCP Extended Data Offset Option to the IESG as a Proposed Standard RFC
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


TCP segments include a Data Offset field to indicate space for TCP options but the size of the field can limit the space available for complex options such as SACK and Multipath TCP and can limit the combination of such options supported in a single connection. This document updates RFC 9293 with an optional TCP extension to that space to support the use of multiple large options. It also explains why the initial SYN of a connection cannot be extending a single segment.


Dr. Joseph D. Touch
Wesley Eddy

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)