[Pdns-users] Reverse Lookup zone subnetted

[Alan Hodgson]

On Fri, 2019-07-19 at 12:55 +0000, bryantz-pdns at zktech.com wrote:
> If we do the following dig against our dns server we get a
> failure... 
> 
>  dig -x 65.183.176.179 @ns1.granddial.net
> ; <<>> DiG 9.9.4-rpz2.13269.14-P2 <<>> -x 65.183.176.179
> @ns1.granddial.net
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 30112
> ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
> ;; WARNING: recursion requested but not available
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 1680
> ;; QUESTION SECTION:
> ;179.176.183.65.in-addr.arpa.   IN      PTR
> ;; Query time: 24 msec
> ;; SERVER: 216.109.195.252#53(216.109.195.252)
> ;; WHEN: Fri Jul 19 08:49:21 EDT 2019
> ;; MSG SIZE  rcvd: 56
> 

Your server isn't supposed to serve the standard PTR. The PTR zone is
actually still served by your provider. What they serve is a CNAME that
points to the fake name on your server and they delegate a small fake
zone to you to manage it. All you need to make sure is that dig
@ns1.granddial.net ptr 179.160/27.176.183.65.in-addr.arpa returns the
correct PTR.


It looks like it's mostly setup right from here, except that you're
currently returning multiple PTR records, which is unlikely to work as
expected (yes I know it's technically allowed).


> dig @ns1.granddial.net ptr 179.160/27.176.183.65.in-addr.arpa
> 
> ; <<>> DiG 9.12.3-P4 <<>> @ns1.granddial.net ptr
> 179.160/27.176.183.65.in-addr.arpa
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12892
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
> ;; WARNING: recursion requested but not available
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 1680
> ;; QUESTION SECTION:
> ;179.160/27.176.183.65.in-addr.arpa. IN PTR
> ;; ANSWER SECTION:
> 179.160/27.176.183.65.in-addr.arpa. 120 IN PTR  mail.granddial.net.
> 179.160/27.176.183.65.in-addr.arpa. 120 IN PTR  mail.granddial.com.
> ;; Query time: 64 msec
> ;; SERVER: 216.109.195.252#53(216.109.195.252)
> ;; WHEN: Fri Jul 19 06:17:23 PDT 2019
> ;; MSG SIZE  rcvd: 127
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