Who wants to get rid of A lookups? "A" is going to be here for a while and using it as a generic mean to get all addresses of given protocol (regardless of version) gives servers a way to smoothly transition over versions. If the A was updated to have a variable address length, then it could be used to hand out any address with different RDLEN instead of making new type. I'm dreading of a day when somebody implements A,AAAA, and AAAAAAAA lookup in glibc stub in parallel.
On Mon, Mar 21, 2016 at 4:58 PM, Mark Andrews <ma...@isc.org> wrote: > > Well we really want to get rid of A lookups. Why don't we just > recommend that we publish mapped A records in AAAA RRsets and have > master servers update AAAA RRsets if they are inconsitent with the > A RRsets. > > We also need a way to signal that there are no A records in the > AAAA RRset. ::ffff:255.255.255.255 or ::ffff:0.0.0.0 would be > sensible records to indicate this. Do we need that? I'd be happy if clients use just A for IP lookups, and then use AAAA if only AAAA falls out of cache. Can't think of a good use case. > > Mark > > -- > Mark Andrews, ISC > 1 Seymour St., Dundas Valley, NSW 2117, Australia > PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org >
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