Reverse lookups not working when Internet connection failed.

[Cuttler, Brian R (HEALTH)]

Come to think of it I don't have the trailing dot either.
I thought the dot was to terminate domain name qualification for forwarder records.


zone "174.50.10.in-addr.arpa" in {
        type master;
        file "db.10.50.174";
};


-----Original Message-----
From: bind-users <bind-users-bounces at lists.isc.org> On Behalf Of Cuttler, Brian R (HEALTH) via bind-users
Sent: Friday, November 4, 2022 2:09 PM
To: Grant Taylor <gtaylor at tnetconsulting.net>; bind-users at lists.isc.org
Subject: RE: Reverse lookups not working when Internet connection failed.

ATTENTION: This email came from an external source. Do not open attachments or click on links from unknown senders or unexpected emails.


My pointer zones are more like

Zone "28.66.136.193.in-addr.arpa.", I've never had that leading "0-"

Is that typical? What does it do?


-----Original Message-----
From: bind-users <bind-users-bounces at lists.isc.org> On Behalf Of Grant Taylor via bind-users
Sent: Friday, November 4, 2022 1:07 PM
To: bind-users at lists.isc.org
Subject: Re: Reverse lookups not working when Internet connection failed.

ATTENTION: This email came from an external source. Do not open attachments or click on links from unknown senders or unexpected emails.


On 11/4/22 10:54 AM, David Carvalho via bind-users wrote:
> Thanks for the replies.

You're welcome.

> My reverse zone in named.conf. My secondary dns gets it automatically
> daily, along with the "di.ubi.pt.".

ACK

> zone "0-28.66.136.193.in-addr.arpa." IN {
>          allow-query { any; };
>          type master;
>          file "rev0.hosts";
> };

That confirms that the origin is in fact "0-28.66.136.193.in-addr.arpa."
  (Save for any typo that I may have introduced.)

> I'll have to study more about some things you guys wrote. This is
> getting complicated 😉

So when your system(s) try to do a reverse DNS (PTR) lookup for
193.136.66.1, it will actually do a PTR lookup for
1.66.136.193.in-addr.arpa. and fail because you don't have a copy of the
66.136.193.in-addr.arpa. zone file locally.

At least my understanding is that you have a copy of your forward zone,
and your 0-28.66.136.193.in-addr.arpa. zone.  But you don't have a copy
of, nor access to, the intermediate 66.136.193.in-addr.arpa. zone that
references the 0-28.66.136.193.in-addr.arpa. zone.

Does that help?

Please feel free to ask additional questions.



--
Grant. . . .
unix || die

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