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 provides a new DHCPv4 option to enables a DHCP 4o6 client to request binding of its DHCPv4 and DHCPv6 addresses in a Softwire. The security considerations section states that the security considerations of DHCP 4o6 are applicable to this draft, and I agree. I do not see any need for text beyond what is already written. I believe it is Ready to publish.