[SOLVED] question about reverse records

[kilburn]

No, you don't understand. The zone where these records are defined is owned by your ISP, not by you. Thus, you have no authority at all to directly define records in it.

Obviously, you can configure your bind to pretend that it has control over the zone, just like you can configure it to pretend that it owns "google.com". The point is that *nobody* will be asking you about DNS records for "google.com" because you're not an authority of this zone, so you would be just wasting your time. It's the same exact thing with reverse DNS zones: you are *not* an authority for the "yyy.zzz.ttt.in-addr.arpa" zone, so *nobody* will ask you for the "PTR" record of "xxx.yyy.zzz.ttt.in-addr.arpa" DNS record (which is how a reverse DNS query is resolved). DNS resolvers will ask to the zone's authority (your ISP), and get the same exact response unless your ISP changes it. It simply doesn't matter what you do your own server.

That said, they probably let you change your reverse DNS through some section of their control panel. Look around there or just ask your ISP directly on how can you do it.