Reverse lookup problem

[Kevin Darcy]

Do "dig 244.17.198.in-addr.arpa ns" to see what 3 nameservers the zone has been
delegated to. arcux.arc.com and home.arc.com can't even be resolved into addresses.
As for the third server -- dnsprimary1.clark.net -- it appears to have no knowledge
of 17.198.in-addr.arpa and times out queries for 244.17.198.in-addr.arpa, so it's
basically useless. Your reverse domain is therefore unreachable. Tell your provider
to fix the delegations.


- Kevin


Jane Lemmer wrote:

> We are having a reverse lookup problem.  I reviewed some of the messages
> is the archive and they helped some, but I'm still not quite clear if the problem
> lies with our end, or our ISPs.  I am also not a BIND expert.
>
> We have a Class C network, 198.17.244.x and we run our own DNS locally.
> Sometime last week (around April 12), reverse lookups started failing
> (i.e., nslookup on 198.17.244.10 returns nothing).  Forward lookups still
> work (i.e., nslookup on arclx.reston.carsoninc.com returns 198.17.244.10).
>
> What is confusing to me is that the reverse lookups work fine on hosts
> in our address space (i.e. if I'm on the host where the DNS is located,
> the reverse lookup works, same if I'm on one of our web servers).
>
> We've contacted our ISP twice and they are saying that since we are
> the primary for the IP range, we are responsible for reverse lookup.
>
> But, what I'm not clear on is this:  doesn't someone above us (our
> parent, or whatever they are called) have to let the world know that
> we are the primary for that IP range?
>
> Some terminology I've seen is "the ISP needs to delegate the
> reverse domain to our server".
>
> I can't seem to ask the right question to the ISP to figure out if this
> is the problem or not.
>
> We haven't made any changes to our DNS that I know of that
> might be causing this problem.  We did update our version of
> BIND, but that was done March 7.  We also updated one file
> to include a new host, but that was done after the problem
> manifested.
>
> Any help would be greatly appreciated.  If someone could just
> give me a clue as to whether the problem is on our end or
> with our ISP, that would be a great help.
>
> Frustrated,
>
> Jane
>
> Jane M. Lemmer
> Director
> Advanced Research Division
> Richard S. Carson & Associates, Inc.
> (703) 742-6600
> (703) 742-6605 (fax)
> lemmerj at reston.carsoninc.com