RFC 9827 - Renaming the Extended Sequence Numbers (ESN) Transform Type in the Internet Key Exchange Protocol Version 2 (IKEv2)

Status: Proposed Standard
Published: November 2025
Stream: IETF
Pages: 8
Updates: RFC 7296
Errata: No Errata

Abstract

This document clarifies and extends the meaning of Transform Type 5 in Internet Key Exchange Protocol Version 2 (IKEv2). It updates RFC 7296 by renaming Transform Type 5 from "Extended Sequence Numbers (ESN)" to "Sequence Numbers (SN)".

Official Text: RFC 9827
Official Page: RFC 9827 DataTracker
Errata: RFC Editor Errata

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