[ds6-devel] IPv6 DNS requests

[Mauro Tortonesi]

On Mon, 21 Apr 2003, Chris Leishman wrote:

> Hi all,
>
> Can someone remind me what the appropriate way of resolving addresses
> is in an IPv6 & IPv4 environment?

this argument is truly a mess, believe me :-(

> Should the resolver query AAAA and then AA, or both simultaneously and
> wait for both replies?

AFAIK, the ipv6 standards are silent about this. so, each resolver can
follow a different behaviour.

BTW: i guess you wanted to say:

" Should the resolver query AAAA and then A, ..."

and not:

" Should the resolver query AAAA and then A6, ..."

> Someone told me that some servers don't return errors to AAAA requests
> (forcing the client to wait for timeout) - is this true or is the
> person just clueless?

in my experience, i have often encountered this behaviour, but i couldn't
tell if this is a bind bug or the correct way to process AAAA queries.

> Also - is there a generally accepted order (or, better, a standard)
> that a client SHOULD prefer? IPv6 and then IPv4, or the other way
> around?

unfortunately, no. this is application-specific (but i wonder if there is
a way to configure the glibc resolver to return ipv4 or ipv6 addresses
first).

-- 
Aequam memento rebus in arduis servare mentem...

Mauro Tortonesi			mauro at deepspace6.net
				mauro at ferrara.linux.it
Deep Space 6 - IPv6 on Linux	http://www.deepspace6.net
Ferrara Linux Users Group	http://www.ferrara.linux.it