On Wed, May 7, 2008 at 3:56 PM, Sam Fourman Jr. <[EMAIL PROTECTED]> wrote: ... > now that I am trying to host a mail server, I found out my reverse > lookup is not working correctly > > we have a /25 ip block on our T1 ... > however if I change my name server to a local ISP (that I do not use > for service) > > my output is as follows > > Sam$ nslookup 12.192.128.135 > Server: 209.103.196.2 > Address: 209.103.196.2#53 > > ** server can't find 135.128.192.12.in-addr.arpa: NXDOMAIN
How is a DNS client supposed to know that your server should be queried for that information? It asks the servers for the nearest parent zone (192.12.in-addr.arpa) and gets back NS records for your server. It's not working because that parent zone doesn't have those records and therefore isn't delegating the domain to you. So, you need to talk with the people from whom you got that /25 allocation and tell them the names of your authoritative servers and their IP addresses so that they can add the necessary NS records to their zone, pointing at your servers. (The above contains some gross simplifications; go read the DNS nutshell book from O'Reilly for the full details.) Philip Guenther
