reverse lookup for single address

[Ronan Flood]

Tony Tung <tonytung at csua.berkeley.edu> wrote:

> I'm trying to get my name server on my server to answer reverse lookup.
> That is, my server lives at 12.34.56.78 (address faked), but that is the
> only address I have.  I want to be able to do this from a remote server:
> 
> nslookup 12.34.56.78 12.34.56.78

Do you mean explicitly send the query to your machine, which is what
you seem to be doing there, or do you want the reverse to be generally
visible in the DNS using normal lookups?

If the latter, as others have said, you need to sort it out with the
people who manage the zone 56.34.12.in-addr.arpa, either to add your
PTR to the zone, or to delegate your address to you.

> and get a correct resolution.  I've managed to do that much.  However, I
> can no longer reverse-resolve other addresses in the same subnet from my
> own server, i.e., I cannot reverse-map 12.34.56.80.
> 
> Can someone give me some tips?  This is what I have in my named.conf:
> 
> zone "56.34.12.in-addr.arpa" IN {
>         type slave;
>         file "master/pub.rev";
>         masters {
>             64.81.79.2;
>             216.231.41.2;
>         };
> };
> 
> and in pub.rev:
> 
> $ORIGIN 56.34.12.in-addr.arpa.
> $TTL    3600
> @       IN      SOA
> myserver.org. root.myserver.org.  (
>                                 20030406        ; Serial
>                                 3600    ; Refresh
>                                 900     ; Retry
>                                 3600000 ; Expire
>                                 3600 )  ; Minimum
>         IN      NS      myserver.org.
> 78      IN      PTR     myserver.org.


Making the full reverse a zone *might* work, but it's not clear
what master/slave setup you're trying to fit into above.  Try this:

In named.conf:

zone "78.56.34.12.in-addr.arpa" IN {
        type master;
        file "master/pub.rev";
};

and in pub.rev:

$ORIGIN 78.56.34.12.in-addr.arpa.
$TTL    3600
@       IN      SOA
myserver.org. root.myserver.org.  (
                                20030406        ; Serial
                                3600    ; Refresh
                                900     ; Retry
                                3600000 ; Expire
                                3600 )  ; Minimum
        IN      NS      myserver.org.
        IN      PTR     myserver.org.


-- 
                      Ronan Flood <R.Flood at 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)