Reverse DNS Failure

[Kevin Darcy]

Your upstream provider controls the reverse address space, have they
delegated any reverse zones to your nameservers?


- Kevin

The Fifields wrote:

>   Please help - I am sysadmin for an ISP. I am running a Sun-Ultra
> Server with Solaris 7. Users log in through Total-Control and Portmaster
> Access Servers, at which point they are given an IP Address from a pool.
> Two months ago I changed backbone service providers, consequently all
> three class C IP adresses had to be changed. I modified all my DNS files
> accordingly. Since the change, any site that requires a  reverse dns
> lookup is inaccessible to our users. Also, any mail servers (msn.com +
> many more) that require reverse dns lookups refuse our mail. When a
> reverse lookup is done, it just returns "user(x).mydomain.com is not a
> valid address."  Nowhere in any of my radius, dns, or other files am I
> using "user2" or "user3" or anything like it. Instead the dns files are
> set to "mydomain-1," "mydomain-2" etc for the access server pools. I get
> the same error when accessing a site from my server, so it isn't a
> remote-access-server thing. This has been incredibly frustrating for 2
> months now, I have memorized O'Reillys DNS and Bind book, and modified
> my dns tables and /etc/hosts about a billion times, and I cannot figure
> out what is wrong. Does anyone have any idea how the prefix is set on a
> dns name?  Any help would be forever and deeply appreciated.