Reverse Lookups with Forwarders

[Doug Barton]

Ok, simple. The zone you want to forward is 110.252.173.in-addr.arpa. 
There is no need to make it more complicated than that.

Good luck,

Doug


On 07/09/2013 12:18 AM, sumsum 2000 wrote:
> What I am trying to achieve is this:
>
> I am using BIND9 only for forwarding DNS requests to other DNS Servers.
>
> I  want the entire hosts in the
> network   : 173.252.110.0
> with the host range: 173.252.110.1 - 173.252.110.254
>   with a total 254 addresses to be sent for reverse lookup say to DNS :
> 8.8.8.8, using a single zone configuration as shown below.
>
> Instead of having a zone file for each and every IP in the network, i
> want to use one zone file to have all the hosts  in the  network
> 173.252.110.0 to be forwarded to 8.8.8.8.
> So when i do a dig -x 173.252.110.27 which is in the range of the
> specified network, i want  it be forwarded to only 8.8.8.8
>
> When i do  dig on a specific address, it gets resolved, but not through
> the configured DNS 8.8.8.8, but through default DNS 8.8.4.4.  I hope
> this explains the situation which i am trying to solve with a zone file
> delegation.
>
> I am not sure if the zone file configuration is correct.
>
> ==========================================================
> dig -x 173.252.110.27,
>
> ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-14.mlos2.mwg <<>> -x 173.252.110.27
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16896
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;27.110.252.173.in-addr.arpa.    IN    PTR
>
> ;; ANSWER SECTION:
> 27.110.252.173.in-addr.arpa. 39    IN    PTR
> edge-star-shv-13-frc1.facebook.com
> <http://edge-star-shv-13-frc1.facebook.com>.
>
> ;; Query time: 0 msec
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> ;; WHEN: Tue Jul  9 07:11:49 2013
> ;; MSG SIZE  rcvd: 93
>
>
>
> named.conf
> ==========
>                          # named.conf
>                          options {
>                          listen-on port 53 { 127.0.0.1; };
>                          listen-on-v6 port 53 { ::1; };
>                          allow-query {localhost;};
>                          recursion yes;
>                          dump-file       "/var/named/data/cache_dump.db";
>                          statistics-file "/var/named/data/named_stats.txt";
>                          memstatistics-file
> "/var/named/data/named_mem_stats.txt";
>
>
>                          directory "/var/named";
>                          version "none";
>                          max-cache-size 134217728;
>                          forward only;
>                          };
>
>                          include "/etc/rndc.key";
>                          include "/etc/named.conf.test";
>
> named.conf.test:
> ==============
>                          view "default" IN {
>                          max-cache-ttl 600;
>                          max-ncache-ttl 600;
>
>                          zone  "." IN  {
>                                  type forward;
>                                  forwarders {8.8.4.4;};
>                                  forward only;
>                          };
>
>
>                          zone "0/24.110.252.173.in-addr.arpa" IN {
>                                  type forward;
>                                  forwarders {8.8.8.8;};
>                                  forward only;
>                          };
>                          };
> ~
>
>
> On Tue, Jul 9, 2013 at 12:23 PM, Doug Barton <dougb at dougbarton.us
> <mailto:dougb at dougbarton.us>> wrote:
>
>     It's not at all clear from your description what you're trying to
>     accomplish. Particularly it's not clear what you seem to be trying
>     to accomplish with the 2317 delegation for a /24 zone.
>
>     Can you describe what you're trying to do, and why? It may be easier
>     to help you that way. Please use the actual zone(s) you're working
>     with, as that will also make it easier.
>
>     Doug
>
>     https://dougbarton.us/DNS/__bind-users-FAQ.html#RealNames
>     <https://dougbarton.us/DNS/bind-users-FAQ.html#RealNames>
>
>