Transmission Control Protocol
RFC 9293, “Transmission Control Protocol”, is an Internet Standard document published in August 2022 by W. Eddy. It updates RFC 1011, RFC 1122, RFC 5961. It obsoletes RFC 793, RFC 879, RFC 2873, RFC 6093, RFC 6429, RFC 6528, RFC 6691. The canonical text is published by the RFC Editor.
Abstract
This document specifies the Transmission Control Protocol (TCP). TCP is an important transport-layer protocol in the Internet protocol stack, and it has continuously evolved over decades of use and growth of the Internet. Over this time, a number of changes have been made to TCP as it was specified in RFC 793, though these have only been documented in a piecemeal fashion. This document collects and brings those changes together with the protocol specification from RFC 793. This document obsoletes RFC 793, as well as RFCs 879, 2873, 6093, 6429, 6528, and 6691 that updated parts of RFC 793. It updates RFCs 1011 and 1122, and it should be considered as a replacement for the portions of those documents dealing with TCP requirements. It also updates RFC 5961 by adding a small clarification in reset handling while in the SYN-RECEIVED state. The TCP header control bits from RFC 793 have also been updated based on RFC 3168.
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
The canonical text of RFC 9293 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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- RFC 9290 Concise Problem Details for Constrained Application Protocol APIs
- RFC 9296 ifStackTable for the Point-to-Point Interface over a LAN Type: Definition and Examples
- RFC 9289 Towards Remote Procedure Call Encryption by Default
- RFC 9297 HTTP Datagrams and the Capsule Protocol