You can send multiple queries in parallel, but that's about it. You then have to make a decision on waiting for all answers or just using the first one.
Paul Vixie had a proposal for allowing multiple questions in the same querie, but that hasn't gone very far. There were other proposals, like returning some pottintially usefull records in additional section, but that was also shot down.
If you want to bring this up as a major issue, V6OPS and DNSEXT IETF working groups are the proper forum.
So, right now we are stuck with making multiple queries for A and AAAA records.
-vlad
Sarang Karandikar wrote:
Hi all,
Given that V4-V6 transition will take some time, the default
protocol for communication will still be V4. Hence, I want
to run a dual stack for some time. Can I send multiple
queries (asking server for all A6, AAAA, and A records all
at once), so that I can decide which interface I want to
talk to ? This assumes, of course that I can transmit V6
packets, say by using tunneling or translation etc.
Regards, Sarang.
On May 28 2003 12:04 +0530, Sarang Karandikar wrote:
I mean, it would be quite difficult when a server has an IPV6 Interface, but refuses to return that address as well,
when
given an A query, whereas other might return the same.
I haven't studied the RFCs in detail, but I would consider any DNS server that returns non-A records in the answer section of a NOERROR response to an "A" query to be broken. Now, the authority and additional sections are another matter.
You always ask first for AAAA, then A6 if you insist, and finally A address records.
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