referral doubt

[JINMEI Tatuya / 神明達哉]

At Thu, 29 Jan 2009 15:39:01 +0000,
Luis Silva <luisfilsilva at gmail.com> wrote:

> I have a question related with the contacting external servers.
> If my server receives an referral answer from an external server with 3 NS
> records but just 1 A additional record, what is the normal behaviour? is the
> server supposed to resolve all 3 nameservers or continues with the iterative
> process contacting the server that have the additional A record.

I don't know what's "normal", but BIND9 should continue with the
process with the server that has an address (while trying to resolve
addresses of other NSes).

> For example:
> Trying to resolve www.testing.server.com
> When contacting "server.com" nameserver I receive in the answer 3 NS and 1 A
> Additional record:
> testing.server.com NS ns1.testing.server.com
>  testing.server.com NS ns2.testing.server.com
>  testing.server.com NS ns3.testing.server.com
> ns1.testing.server.com A 192.123.123.23

In this case BIND9 should immediately send a subsequent query to
192.123.123.23.

---
JINMEI, Tatuya
Internet Systems Consortium, Inc.