Dual-stack BIND resolver behaviour

Sherin George list at sheringeorge.co.cc
Thu May 19 05:39:34 UTC 2011

Hi guys,

i am not sure whether this is the right place to ask this question,
but I sincerely feel that my question matches with ongoing discussion
in this thread. If you think that I have hijacked thread, I am
extremely sorry.

Well, my questions are,

1. Can a domain(eg: example.com) have both A reocrd & AAAA record
2. If so, which website will be displayed when accessed from a client
which got both IPv4 & IPV6 connectivity


On Mon, May 16, 2011 at 6:28 PM,  <lst_hoe02 at kwsoft.de> wrote:
> Zitat von Anand Buddhdev <anandb at ripe.net>:
>> On 16/05/2011 14:11, Dennis Perisa wrote:
>>> Hi folks,
>>> We are looking to dual-stack our 9.7.3 DNS resolvers and I had a
>>> question about BIND's behaviour in a dual-stack configuration.
>>> Assuming the resolver's cache is empty, will a query that arrives on
>>> an IPv6 socket always result in an outgoing query to a root server's
>>> IPv6 address? I have the same question for IPv4 queries.
>> Hi Dennis,
>> There's no relation between incoming recursive queries, and the outgoing
>> queries BIND makes to look for answers.
>> Whether BIND contacts the IPv4 or IPv6 address of a server (including
>> the root servers) depends on the latency to that server.
> Does the latency apply per IP or per Hostname? If per Hostname the IPv6
> address will be prefered in case the root servers are reachable by both IPv4
> and IPv6, no? Also first connection will be tried with IPv6 on most OS, no?
> Regards
> Andreas
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