This seems attractive, but what happens when a host that doesn't support WKA or RA turns up on a network that is using RA (and not WKA or DHCPv6(lite)) for DNS configuration? Of course there are other permutations that b0rk as well. What you seem to be saying is, let's implement all three methods on hosts, and then it won't matter what the network actually supports?
I was describing an approach to support multiple mechanism and handle them in a known and predictable way. If they were all implemented then it would not matter what the network supported.
All IPv6 nodes will support RA's for address autoconfiguration, so it is reasonable to assume that they would also support an RA DNS option (if it existed). If well known addresses were defined, then I suspect most hosts would support these by default as well.
Bob
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