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. About this document: SEcure Neighbor Discovery (SEND) defines the Name Type field in the Trust Anchor option. This document request to IANA the creation and management of a registry for this field. This document also specifies a new Name Type field based on a certificate Subject Key Identifier (SKI). My comments: The document has no major technical shortcomings that I could find. I do note that the new registry value defined in this document relies on SHA-1 (160). This may be a good time to save a few RFC numbers and define a value for the impending other SHA values, like SHA-2, although I'm not so sure they exist in x.509 certificates yet. Pat