Hello, 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. My apologies for the tardiness of this review. This draft describes an experimental way to use existing protocols to address a tunnel convergence problem where multiple instance of the same multicast traffic converges to the same Mobile Access Gateway. It also defines a new option to support dynamic policy subscriptions for use with the Proxy Binding Acknowledge message. It is heavy on acronyms and could use some additional definitions in section 2 for things like "MAG" and "LMA" (note: I am not a proxy mobile IPv6 person). The draft is ready for publication but I do have a few comments: 1. It would be easier to read if you move the definition of the new option before the description of the two operational modes that define the experimental solution, that presumably use the new option. 2. the protocol field "maps the type codification used in the original MLD specification for the Report message" and gives two explicit values. Is there a registry for this mapping somewhere that might be better to point at? 3. are bits really set to zero and set to one? I thought they were set (1) and cleared (0). 4. the security considerations say that the draft just explains how to use existing protocols without modification and therefore does not introduce new security threats. That makes me think that the problem hasn't even been looked at. It is certainly possible to use existing protocols in a way that introduces security problems. Maybe expand on why there are none. Also, the draft introduces a new option for dynamic policy subscriptions. Are there no security issues associated with that addition? If so, it might be good to mention that. Again, sorry for the delay, I hope these comments are still useful. regards, Dan.