[CentOS] how do I find out which nameserver returns a DNS query?

> Ok, sorry, let me re-phrase.
>
> I want to know on my own server, which of my nameservers replied to the DNS
> query. In this example 4.2.2.1 is our ISP's upstream DNS server, which is
> configured in /etc/resolv.conf - so it should technically appear there.
>
> But, let's say I query host1.myserver.co.za - and myserver.co.za is on
> another server, and has ns1.myserver.co.za, ns2.myserver.co.za,
> ns3myserver.co.za & ns4.myserver.co.za
>
> So, as far as I know, any one of those can reply (round robbin DNS?), but I
> would like to know which one replies for this particular dig. Is that
> possible? I don't want to specify a server to query, I want to find out
> which of the 4 returns the query. If it's a cached reply, does it mean I
> won't see it?
>
>

is "dig +trace host" what you are looking for?
if not then the bind-users mailing list is a fantastic resource for
all dns queries
(pun intended)

mike