{"draft":"draft-ietf-ipsecme-ikev2-rename-esn-05","doc_id":"RFC9827","title":"Renaming the Extended Sequence Numbers (ESN) Transform Type in the Internet Key Exchange Protocol Version 2 (IKEv2)","authors":["V. Smyslov"],"format":["HTML","TEXT","PDF","XML"],"page_count":"8","pub_status":"PROPOSED STANDARD","status":"PROPOSED STANDARD","source":"IP Security Maintenance and Extensions","abstract":"This document clarifies and extends the meaning of Transform Type 5\r\nin Internet Key Exchange Protocol Version 2 (IKEv2). It updates RFC\r\n7296 by renaming Transform Type 5 from \"Extended Sequence Numbers\r\n(ESN)\" to \"Sequence Numbers (SN)\". It also renames two currently\r\ndefined values for this Transform Type: value 0 from \"No Extended\r\nSequence Numbers\" to \"32-bit Sequential Numbers\" and value 1 from\r\n\"Extended Sequence Numbers\" to \"Partially Transmitted 64-bit\r\nSequential Numbers\".","pub_date":"November 2025","keywords":["replay protection","anti-replay","IPsec","ESP","AH"],"obsoletes":[],"obsoleted_by":[],"updates":["RFC7296"],"updated_by":[],"see_also":[],"doi":"10.17487\/RFC9827","errata_url":null}