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Lacking a formal definition of "between," the following normative statement is ambiguous: "AdvDefaultLifetime MUST either be zero (the router is not to be used as a default router) or be a value between MaxRtrAdvInterval and 65535." Normative statements cannot be ambiguous. Please clarify whether this is an inclusive "between" or an exclusive "between."
Section 4 contains: As explained in Section 3, the relationship between MaxRtrAdvInterval and AdvDefaultLifetime must be chosen to take into account the probability of packet loss. The use of a non-normative "must" here indicates that you probably want to update your RFC2119 boilerplate to be RFC8174 boilerplate.
I like what the document does, but it could really really do with a good editing pass; I've sent some nits / comments to Suresh off-list. Some bits I was unable to parse, but I trust Suresh to fix them. I'm a bit surprised it doesn't mention RFC7772 - it feels very related to me, but I may just be wrong!
Just one quick question to double-check: Are the defaut values in RFC4861 still recommended or not? Maybe note this in the text to avoid any confusion! Also, as already noted in the sphepherd write-up, the abstract should mention the update.
I'm just testing something, and wanted to get a protocol trace. Will look at draft later.
I am an author.