The queries should work if you query an authoritative dns server for
that zone. If you are querying a recursive only server(when Internet
connection is down), it won't be able to find the authoritative server
and will answer only if it has valid cached answer. Once that cached
answer expires or is not there, a recursive only server will fail to
give you the answer you seek.
That is very dependent on your internal dns setup and the type of dns
server you are querying.
Lyle Giese
On 11/4/22 11:07, David Carvalho via bind-users wrote:
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-boun...@lists.isc.org> On Behalf Of Matus UHLAR
- fantomas
Sent: 04 November 2022 16:02
To: bind-users@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?
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Support bacteria - they're the only culture some people have.
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