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. Summary: Ready The security considerations section is kept minimum since it only adds IPv6 format support to the "Dissemination of Flow Specification Rules" (draft-ietf-idr-rfc5575bis-26) document where the full Security Consideration discussion takes place. I also believe there is no added security issue. Typo: - Introduction: typo, add a final "s" to propose in: "and propose a subset..." Cheers, Vincent