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. The I-D updates RFC 3315 to allow the Rebind message type to appear in the Reconfigure Message option of a Reconfigure message; and clarifies how a DHCPv6 client responds to a received Reconfigure message.   The existing Security Considerations section is a bit soft/vague. It speaks correctly of the possible risk of an attacker induced disconnect and relink. And it states these attacks may be prevented by using the AUTH option or Secure DHCPv6. However it is vague in the overall system risks / preconditions under which the risks arise and should also be more clear about when these mitigation strategies should/SHOULD be used (instead of "may"). Best regards, Tobias