Reverse Lookups with Forwarders

Leonard Mills lenm at yahoo.com
Tue Jul 9 06:41:51 UTC 2013


Sorry for top-post.

Your expectation is incorrect.
    zone "0/24.110.252.173.in-addr.arpa"
is not the same as
    zone "173.252.110.24.in-addr.arpa"

hth,
Len



>________________________________
> From: sumsum 2000 <sum2hike at gmail.com>
>To: bind-users at lists.isc.org 
>Sent: Monday, July 8, 2013 11:21 PM
>Subject: Reverse Lookups with Forwarders
> 
>
>
>I have a reverse lookup zone file configuration as follows:
>zone "0/24.110.252.173.in-addr.arpa" {
>type forward; forward only;
>forwarders {10.10.96.1;};
>};
>
>
>When I do dig -x 172.252.110.27, I expect it to forward it to 10.10.96.1, but instead, it uses the default resolver.
>
>Am I missing something.
>
>
>
>The address space 173.252.110.0/24 matches 255 address ranging from 173.252.110.0-255. So if DNS Server X is configured against this zone , then any reverse DNS request for 173.252.110.0-173.252.110.255 should be forwarded via DNS Server X
Currently this is not the case. There is no forwarding in the above scenario ( where CIDR notation x.x.x.x/Mask is used) . All requests are forwarded via global resolver only
Although a reverse lookup x.x.x.x/Mask does route through DNS Server X but this does not seem to be valid QNAME format for PTR queries.
>
>
>Only when the zone file is changed to 
>zone "110.252.173.in-addr.arpa" IN {
>type forward;
>forwarders {10.10.96.1;};
>forward only;
>};
>
>
>All the requests for 
>
>173.252.110.0-173.252.110.255  is forwarded to 10.10.96.1. 
>
>
>
>
>
>
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>
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