Reviewer: Sheng Jiang Review result: Ready Hi, OPS-DIR, Authors, I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review. Document editors and WG chairs should treat these comments just like any other last call comments. This standard track document re-define of the NSEC and NSEC3 TTL to correct the situation tha aggressive use of NSEC and NSEC3 records may deny names far beyond the intended lifetime of a denial. This document updates several RFCs that depend on these definition. This document is well-written and READY for publication. Regards, Sheng