Review of draft-ietf-ospf-hmac-sha-06.txt Do not be alarmed. 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 only comment on this greatly improved document concerns the last paragraph of section 4: Use of full digital signatures would ... eliminat[e] the replay issue that was noted above. Replay can remain a problem even with signed data, can't it? I think that two-way communication is may be a requirement for eliminating the possibility of replay. Hilarie