I suppose following has been discussed to the death in the dawn of
IPNG, but ...
When an application is presented with a domain name, it cannot know
whether it maps to IPv6 or IPv4 address. Thus the resolver library
needs to make a query for both A and AAAA records. (Right?)
Just writing a resolver based on reading the RFC-1035, the first idea
was: hey! you can put both queries into same message, just have the
QDCOUNT=2...
... but, we quickly found that apparently nobody supports such thing.
Anyone care to comment the background of this: why the multiple query
feature of RFC-1035 is not implemented?
The KAME resolver appears to first send an AAAA query, and if that
results an error, it then sends A query.
Another idea is to send both AAAA and A in parallel and then use the
first good answer, if any arrives. And, when A6 is added, we have 3
queries to send?
--
Markku Savela ([EMAIL PROTECTED]), Technical Research Centre of Finland
Multimedia Systems, P.O.Box 1203,FIN-02044 VTT,http://www.vtt.fi/tte/staff/msa/
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