problem with DNS lookups on non-IPv4-only-mode?

[Gert Doering]

Hi,

On Wed, Jun 09, 2004 at 03:52:07PM +1000, Darren Tucker wrote:
> tcpdump shows the AAAA requests being sent, but no answer is received. 
> It looks like the DNS server just drops the requests rather than sending 
> a negative reply.

Which is a well-known misbehaviour of some DNS server "implementations",
unfortunately.

If you're interested in more details, see the IETF-Draft
draft-ietf-dnsop-ipv6-dns-issues-07.txt, section 3, "observed DNS
implementation misbehaviour", and also (for further sources of surprise)
draft-ietf-dnsop-misbehavior-against-aaaa-01.

The essence of it is that there is not very much a client resolver can do
about it - it can query v4 and v6 in parallel (which is something the
C library would need to do internally) or just use v4 only, which would
be an unfortunate step backwards.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
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