RFC 6691 · INFORMATIONAL · 2012
MON · 27 JUL 2026
TCP Options and Maximum Segment Size
Overview
RFC 6691, “TCP Options and Maximum Segment Size”, is an Informational document published in July 2012 by D. Borman. It updates RFC 879, RFC 2385. It has been obsoleted by RFC 9293 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This memo discusses what value to use with the TCP Maximum Segment Size (MSS) option, and updates RFC 879 and RFC 2385. This document is not an Internet Standards Track specification; it is published for informational purposes.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 6691 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 2012
- RFC 6690 Constrained RESTful Environments Link Format
- RFC 6692 Source Ports in Abuse Reporting Format Reports
- RFC 6689 Usage of the RSVP ASSOCIATION Object
- RFC 6693 Probabilistic Routing Protocol for Intermittently Connected Networks
- RFC 6688 Parallel NFS Block Disk Protection
- RFC 6694 The "about" URI Scheme
- RFC 6687 Performance Evaluation of the Routing Protocol for Low-Power and Lossy Networks
- RFC 6695 Methods to Convey Forward Error Correction Framework Configuration Information