172.16/12 Reverse Maps Don't work.

Chris chris at pop.ucsd.edu
Thu Jun 16 22:16:50 UTC 2005


"Martin McCormick" <martin at dc.cis.okstate.edu> wrote in message 
news:d8sopp$9a4$1 at sf1.isc.org...
> We have bind9 correctly serving several private-network zones
> but I can't for the life of me, get the reverse map for
> 172.16.IN-ADDR.ARPA. to work at all.
>
> The start of the zone looks like:
>
> ;
> ; 16.172.in-addr.arpa
> ;
>
> $TTL 43200
> @       IN     SOA  ns.xyz. martin.dc.cis.okstate.edu.  (
>                                1; Serial
>                                    14400; Refresh
>                                    900; Retry
>                                  1209600; Expire
>                                   30 ) ;Minimum
>  IN NS ns.xyz.
>  IN NS ns2.xyz.
> 1.16.172.IN-ADDR.ARPA. 43200 IN PTR ns.xyz.
>
> All reverse queries to 172.16.1.1 take what I frustratedly
> like to call the thousand-mile route in that, instead of going across
> the room where they physically are, they get a bit lost out there in
> the Internet.
>
> dig @172.16.1.1 172.22.12.4 -x (an address registered in the network)
>
>
> ; <<>> DiG 9.2.3 <<>> @172.16.1.1 -x 172.22.12.4
> ;; global options:  printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26347
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;4.12.22.172.in-addr.arpa. IN PTR
>
> ;; AUTHORITY SECTION:
> 22.172.in-addr.arpa. 9594 IN SOA prisoner.iana.org. 
> hostmaster.root-servers.org. 1 604800 60 604800 604800
>
> ;; Query time: 1 msec
> ;; SERVER: 172.16.1.1#53(172.16.1.1)
> ;; WHEN: Thu Jun 16 15:18:23 2005
> ;; MSG SIZE  rcvd: 119
>
>
> The name server log says that the zone successfully loaded but
> lookups can't find any reverse information.
>
> We did have reverse lookups in that network working when we
> had a Class C-sized subnet active at 172.16.1/24.  It only broke when
> I thought I redefined the IN-ADDR.ARPA. zone to encompass the entire
> /12 network from 172.16.0.1 through 172.35.255.254.
>
> Any ideas as to why this isn't working?
>
> Thank you.

Am I missing something here? You have created a zone on your server for 
1.16.172.in-addr.arpa but then you are doing a reverse lookup on 
172.22.12.4. Have you also created a reverse zone for 12.22.172.in-addr.arpa 
as well or not?

The address that you are digging for, 172.22.12.4 will not be in a 
16.172.in-addr.arpa zone.

Chris.




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