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 a DNS mechanism that is used with an IPv6/IPv4 translator to enable an IPv6-only client and IPv4-only server to communicate. The document is well-written, and the security considerations seem adequate. I see no issues with this document.

--Scott