DNS Problem: Help!

[Ragnar Paulson]

>
>
> We're having an odd problem with one ISP whose customers make use of our
> University network resources. The problem is that our name servers are
> finding incorrect Authoritative name servers for the IP address in
> question (actually a range of addresses beginning at 24.57.128.0 - not
> their entire address space, just part of it). The IP address for their
> name server NS.CGOCABLE.NET comes back as 24.226.1.11 which is wrong, it's
> not even a name server. It should be 24.226.1.94! If I restart named it
> sometimes picks up the correct address. I just restarted both my name
> servers and find that they have, once again, an incorrect address.

Are you trying to resolve an ip address to a name or vice versa?  The NS
records for cgocable.net. in the gtld servers are
NS2.cgocable.net and ns4.cgocable.net.   Those servers return 24.226.1.94
for ns.cgocable.net but that is just an address record.

I see no delegation for 128.57.24.in-addr.arpa. at all.  So reverse name
lookups in that range don't work for me at all.

Ragnar

>
> I have no affiliation with this ISP, they won't return any of my calls and
> they don't seem to be aware of a problem! Is there anyway this could be a
> problem at our end? Is there anyway to find out who gave our name server
> the incorrect data? Is there anyway to force our name servers to lookup
> this information again without restarting named? Any help would be
> appreciated.
>
> diggins at myserver<local/named># nslookup
> Default Server:  localhost
> Address:  127.0.0.1
>
> > set norecursive
> > 24.57.131.72
> Server:  localhost
> Address:  127.0.0.1
>
> Authoritative answers can be found from:
> 131.57.24.in-addr.arpa  nameserver = NS.CGOCABLE.NET
> 131.57.24.in-addr.arpa  nameserver = NS1.CGOCABLE.NET
> NS.CGOCABLE.NET internet address = 24.226.1.11
> NS1.CGOCABLE.NET        internet address = 24.226.1.20
> *** No address (A) records available for 24.57.131.72
>
>
>