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 defines a password authentication protocol for IKEv2 based on PACE (Password Authenticated Connection Establishment). I am neither a cryptographer nor an expert on IPsec or IKEv2. Given these limitations, I will say that I found the Security Considerations section of the document to be thorough. All of the security issues that I could come up with and more were addressed in a credible manner. Overall, the document is clear and well-written. Personally, I do not have any concerns with this document becoming an RFC. However, it might be wise to wise to have a cryptographer or expert in authentication protocols provide an independent review of the document, if that has not already been done. If it has been done, I have no concerns. Thanks, Steve Hanna