http://www.rfc-editor.org/rfc/rfc4718.txt
RFC 4718: IKEv2 Clarifications and Implementation Guidelines, P. Eronen, P. Hoffman2006-10-01T23:00:00-00:00This document clarifies many areas of the IKEv2 specification. It does not to introduce any changes to the protocol, but rather provides descriptions that are less prone to ambiguous interpretations. The purpose of this document is to encourage the development of interoperable implementations. This memo provides information for the Internet community.