I 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 authors, document editors, and WG chairs should treat these comments just like any other IETF Last Call comments. Document: draft-ietf-dhc-v6only-03 Reviewer: Russ Housley Review Date: 2020-06-18 IETF LC End Date: 2020-07-02 IESG Telechat date: unknown Summary: Has Nits Major Concerns: None. Minor Concerns: Section 3.4 includes: V6ONLY_WAIT The minimum time the client SHOULD stop the DHCPv4 configuration process for. MUST be no less than MIN_V6ONLY_WAIT seconds. Default: 1800 seconds The second sentence should include a subject; and "MUST NOT" seems like a better wording to me. I suggest: V6ONLY_WAIT The minimum time for which the client SHOULD stop the DHCPv4 configuration process. The value MUST NOT be less than MIN_V6ONLY_WAIT seconds. Default: 1800 seconds. Nits: Section 2: s/seems only natural/seems natural/ Section 3.3.1: s/for V6ONLY_WAIT second/for V6ONLY_WAIT seconds/