dig +trace to find all the forwarders?

[Mark Andrews]

In message <n2t46e76f621004242012j929f5087r98cb82155241f21d at mail.gmail.com>, Jo
sh Kuo writes:
> Hi all,
> 
> I am trying to trace a recursive outbound query. My workstation is
> configured to point to the forwarder/resolver 192.168.0.2, which is a
> dedicated forwarder that is configured to forward all DNS queries to the
> ISP's DNS resolver. Sometimes I get name resolution failures, and I want to
> know if it is the ISP's DNS resolver is forwarding recursive queries to yet
> another server... when using 'dig example.com +trace', it only shows the
> recursive lookup starting at the root domain, instead of showing from my
> 192.168.0.2 -> ISP -> ? -> root name servers.
> 
> Is there any way to discover all the forwarders/resolvers along the way
> before my query hits one of the root name servers? Or is that an impossible
> feat unless I have administrative access to each of the resolvers/forwarders
> to look at its configuration?

You need administrative access to see the overides to the normal resolution
process.

Mark
 
> Thanks in advance.
> 
> -Josh
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org