Hi, I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. This document describes the way to avoid IP fragmentation of large IKEv2 messages. This allows IKEv2 messages to traverse network devices that don't allow IP fragments to pass through. I see no major issues with this document. There is still a minor issue where you move the exhaustion attack from the IP layer to the IKE layer -- an attacker could, theoretically, fill an IKE session with incomplete fragments causing it to use resources waiting for missing fragments. -derek -- Derek Atkins 617-623-3745 derek at ihtfp.com www.ihtfp.com Computer and Internet Security Consultant