Reverse dns des not reach my IP

[Andy Shellam]

This is because your ISP owns the DNS zone that looks up the reverse 
mapping for your IP address.

Your DNS servers are authoritative for forward-mapping on mydomain.com, 
but your ISP's DNS servers (or their IP registry) are authoritative for 
1.123.123.123.in-addr.arpa (the reverse-mapping zone for your IP address).

Either:

1. ask your ISP to change the reverse DNS for your IP to the domain you 
require
2. ask them to delegate 123.123.123.in-addr.arpa to your DNS servers 
(which unless you own the entire 123.123.123.x range, it's unlikely 
they'll do.)  I'm not sure if you can delegate a single record.

Option 1 is by far the easiest.

Andy.

Alex Jalali wrote:
> Hello,
>  
>
> My ISP has given me and IP address but they have also given it a name to
> manage things let say:  server-123.123.123.1.my-isp.com 
>
>  
>
> In my server I have setup mydomain.com to map to 123.123.123.1 which is
> fine. but when doing a reverse DNS check it only reaches up to
> server--123.123.123.1.my-isp.com and does not reach to mydomain.com.
>
> Is there something I can add to my zone file for the reverse look up to
> reach mydomain.com
>
>  
>
>  
>
> I have bind 8. This is in named.conf
>
>  
>
> zone "123.123.123.in-addr.arpa" IN {
>
>         type master;
>
>         file "123.123.123";
>
>         allow-query { any; };
>
>         allow-update { none; };
>
> };
>
>  
>
> and this is my reverse DNS zone file "123.123.123" :
>
>  
>
>  
>
> $TTL    86400
>
> @                       1D IN   SOA     ns1.mydomain.com
> hostmaster.mydomain.com. (
>
>                                 2003051603 ; serial
>
>                                 3H ; refresh
>
>                                 15M ; retry
>
>                                 1W ; expiry
>
>                                 1D ; minimum
>
>                                 )
>
> @                       1D IN   NS      ns1.mydomain.com.
>
> @                       1D IN   NS      ns2.mydomain.com.
>
>  
>
>  
>
>  
>
>  
>
>  
>
>
>
>
>
> !DSPAM:37,4629591989296811841498!
>
>
>