Re: Newbie: in-addr.arpa file for a C Class

bela@webnet-x.com (belacyrf) wrote:

> Ahhhh crap, one little mistake.. yes it's coxmail servers. I dont like
> publishing name servers in groups. Anyways...
>
> I think I found my problem. I have feeling corporate changes which
> server was authoritative for our IP space and copied our zone file up
> to their server. And I was looking at a file that even though it has
> correct PTR records, it wasn't being used. So I was probably just
> confused.

The issue about trying to obscure the info you give out is that, as in
this case, you can lead people down the wrong track: trying to see why
your nameserver is responding with data you haven't put in the zone file,
when actually it turns out to be a different nameserver responding.

> So just to make sure.. am I correct in assuming that there is no way
> to get a dig or nslookup result of:
> Name: wsip-216-231-10-9.sub.mydomain.net
> Address: 216.231.10.9
>
> without:
> 10 IN PTR wsip-216-231-10-9.sub.mydomain.net

As Barry Margolin said, that would be "9 IN PTR".

> in my zone file?

That's the simplest way of doing it. A wildcard record, "* IN PTR",
couldn't give an address-specific name like wsip-216-231-10-9, but
would return a generic name for those addresses without individual PTRs.

Another approach would be to use a modified nameserver (something like
walldns <http://cr.yp.to/djbdns/walldns.html>), if that would be worth
the effort.

--
Ronan Flood <R.Flood@noc.ulcc.ac.uk>
working for but not speaking for
Network Services, University of London Computer Centre
(which means: don't bother ULCC if I've said something you don't like)