Dual-stack BIND resolver behaviour

Anand Buddhdev anandb at ripe.net
Mon May 16 12:33:08 UTC 2011

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.


Anand Buddhdev

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