RFC 4304: Extended Sequence Number (ESN) Addendum to IPsec Domain of Interpretation (DOI) for Internet Security Association and Key Management Protocol (ISAKMP)
In plain English — editorial summary, not part of the RFC
The IP Security Authentication Header (AH) and Encapsulating Security Payload (ESP) protocols use a sequence number to detect replay. This document describes extensions to the Internet IP Security Domain of Interpretation (DOI) for the Internet Security Association and Key Management Protocol (ISAKMP). These extensions support negotiation of the use of traditional 32-bit sequence numbers or extended (64-bit) sequence numbers (ESNs) for a particular AH or ESP security association. [STANDARDS-TRACK]
Document record
- Document ID
- RFC4304
- Published
- December 2005
- Authors
- S. Kent
- Status
- PROPOSED STANDARD
- Stream
- IETF
- Area
- sec
- Pages
- 5
- Also known as
- —
Topics
Related documents
Ranked automatically by shared keywords, IETF area and stream — not by editorial selection.
- RFC 4302IP Authentication HeaderCurrent
December 2005
- RFC 4301Security Architecture for the Internet ProtocolUpdated
December 2005
- RFC 4303IP Encapsulating Security Payload (ESP)Current
December 2005
- RFC 4308Cryptographic Suites for IPsecCurrent
December 2005
- RFC 5386Better-Than-Nothing Security: An Unauthenticated Mode of IPsecCurrent
November 2008
- RFC 2857The Use of HMAC-RIPEMD-160-96 within ESP and AHCurrent
June 2000
- RFC 2403The Use of HMAC-MD5-96 within ESP and AHCurrent
November 1998
- RFC 9827Renaming the Extended Sequence Numbers (ESN) Transform Type in the Internet Key Exchange Protocol Version 2 (IKEv2)Current
November 2025
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