Mouse wrote:
There is NOTHING in the DNS protocol for a client to signal that it prefers $
Isn't that what the QTYPE is for?
As far as I can tell, the only way to ever get both A and AAAA in the
answer section to a single query is to query for type ANY, which isn't
usually done because of the way ANY queries interact with caches.
According to the original RFC1035 DNS protocol specification, the question
section of
the DNS request packet can contain any number of queries, usually 1 it says
(page 28).
It would be perfectly legal, according to the RFC, to put an A and an AAAA query
in the same DNS request packet, and the reply would contain A and AAAA answers.
However, in practice nobody does this. I presume because widely deployed DNS
server or resolver software does not properly implement it.
Rob
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