all,

short and sweet document; a few comments if I may.

- this new behaviour is supposed to be implemented by all hosts, right? 
shouldn't this document then update rfc4861?
- "AP" isn't defined section 1.
- section 1 bullet b. couldn't you argue that turning off periodic RAs is a 
configuration error?
- section 1 bullet c. If a link isn't multicast capable, you couldn't send RS 
in the general case either.
                             ISATAP has special provisions for that. could you 
make c) more general?

- section 2.1. "…results in a default route". is awkward. this is the function 
we call "router discovery" in rfc4861,
                     where the host discovers a "default router". perhaps just 
copy or reference rfc4861 verbatim:
   "Once the host sends a Router Solicitation, and receives a valid
   Router Advertisement with a non-zero Router Lifetime, the host MUST
   desist from sending additional solicitations on that interface, until
   the next time one of the above events occurs.  Moreover, a host
   SHOULD send at least one solicitation in the case where an
   advertisement is received prior to having sent a solicitation.
   Responses to solicited advertisements may contain more information
   than unsolicited advertisements."

Best regards,
Ole

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