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

In plain English — editorial summary, not part of the RFC

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)". It also renames two currently defined values for this Transform Type: value 0 from "No Extended Sequence Numbers" to "32-bit Sequential Numbers" and value 1 from "Extended Sequence Numbers" to "Partially Transmitted 64-bit Sequential Numbers".

Document record

Document ID
RFC9827
Published
November 2025
Authors
V. Smyslov
Status
PROPOSED STANDARD
Stream
IETF
Area
sec
Pages
8
Also known as
—
Updates:
RFC 7296

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

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canonical URL: /rfc/9827-renaming-the-extended-sequence-numbers-esn-transform-type-in-the-internet-key-ex