Hi, 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 summary of the review is READY. The Security Considerations section is appropriate for the document. It looks like all of the CLUE documents may become RFCs at, or near the same time. If that is the case, the authors and shepherd may want to include a common statement that implementers should read the security considerations sections of each of the other associated documents. Regards, Chris