Last Call Review of draft-ietf-v6ops-v6nd-problems-
review-ietf-v6ops-v6nd-problems-secdir-lc-weis-2012-02-23-00

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 IPv6 Neighbor Discovery (ND) operational problems
encountered IPv6 routers. The root issue is the large subnet sizes that are
typically used, where a router naively reacting to the discovery of IPv6
addresses within an entire subnet can cause resource exhaustion issues. The
document suggests techniques that protocol implementors and operators can
employ to mitigate the resource exhaustions.

The document adequately describes the resource exhaustion as a DoS opportunity.
The advice itself does not appear to create any new DoS considerations. I
believe it is ready to publish.

Brian