Reverse lookups not working when Internet connection failed.

[David Carvalho]

Thanks for the replies.
My reverse zone file

$TTL 86400
@       IN      SOA     di.ubi.pt. postmaster.di.ubi.pt (
                        2020040401      ; serial
                        28800           ; refresh 3h
                        7200            ; retry 1h
                        604800          ; expire 1w
                        86400 )         ; ttl 1d

; Servidores de nomes

        IN      NS      dns.di.ubi.pt.
        IN      NS      dns2.di.ubi.pt.

0.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.0
1.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.1
2.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.2
3.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.3
4.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.4
5.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.5
6.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.6
7.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.7
8.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.8
9.0-28.66.136.193.in-addr.arpa.         IN      A       193.136.66.9
10.0-28.66.136.193.in-addr.arpa.        IN      A       193.136.66.10
11.0-28.66.136.193.in-addr.arpa.        IN      A       193.136.66.11
12.0-28.66.136.193.in-addr.arpa.        IN      A       193.136.66.12
13.0-28.66.136.193.in-addr.arpa.        IN      A       193.136.66.13
14.0-28.66.136.193.in-addr.arpa.        IN      A       193.136.66.14

; Reverse mapping

1       IN      PTR     dns.di.ubi.pt.
2       IN      PTR     dns2.di.ubi.pt.
3       IN      PTR     geodac.di.ubi.pt.
...




-----Original Message-----
From: bind-users <bind-users-bounces at lists.isc.org> On Behalf Of Matus UHLAR
- fantomas
Sent: 04 November 2022 16:02
To: bind-users at lists.isc.org
Subject: Re: Reverse lookups not working when Internet connection failed.

On 04.11.22 15:41, David Carvalho via bind-users wrote:
>We've had an internet failure for a few days last week and as services 
>got online I found the following:
>
>Dns queries about my.domain from my.domain  worked as expected. Since 
>there was no internet connection, I obviously couldn't  query the outside
world.
>
>Reverse (PTR) Dns queries about my.domain from my.domain didn't work. 
>Now that the internet connection is restored, everything is ok.
>
>
>
>The reverse entries are in the format  "z.y.x.in-addr.arpa."    for IP
x.y.z
>
>Aren't they supposed to work locally when no outside connection is 
>available?

if they are properly configured, yes.

> What could I be missing?

can you provide an example of an IP and configured reverse zone, and the
zone file?

--
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