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From: "DeCaro, James John (Jim) CIV DISA FE (USA)" <james.j.decaro3.civ@mail.mil>
Newsgroups: comp.protocols.dns.bind
Subject: RE: [Non-DoD Source] Re: [DoD Source -- ssshhhh Top Secret] Re: Dumb Question is an A or AAAA record required?
Date: Thu, 9 Jul 2020 15:49:32 +0000
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To: Michael De Roover <isc@nixmagic.com>, "bind-users@lists.isc.org" <bind-users@lists.isc.org>
Thread-Topic: [Non-DoD Source] Re: [DoD Source -- ssshhhh Top Secret] Re: Dumb Question is an A or AAAA record required?
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Xref: csiph.com comp.protocols.dns.bind:15961

We have an application that queries reverse lookups on clients trying to ac=
cess it in order to verify the client and its IP are legit and a part of th=
e correct domain/acl.. So if the pointer record does not match, the client =
is rejected. I don't know if that is relevant in this case, but it provides=
 an example. =20




-----Original Message-----
From: bind-users <bind-users-bounces@lists.isc.org> On Behalf Of Michael De=
 Roover
Sent: Thursday, July 9, 2020 11:20 AM
To: bind-users@lists.isc.org
Subject: [Non-DoD Source] Re: [DoD Source -- ssshhhh Top Secret] Re: Dumb Q=
uestion is an A or AAAA record required?

All active links contained in this email were disabled.  Please verify the =
identity of the sender, and confirm the authenticity of all links contained=
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er. =20




----

On 7/9/20 5:03 PM, Reindl Harald wrote:
> but it still has nothing to do with your domain by definition, the PTR
> could be anything
Of course it can be, they're completely separate name spaces. However=20
would it make any sense in practice to point it somewhere else entirely?=20
You'd probably be better off not setting it at all then. I'd argue that=20
they're meant to match each other.
> but how does that change anything in the simple fact that "Would the
> lack of A records affect pointer records? Seems like it would" given
> that the PTR zone is a dns zone like anything else
> while it's smart (at least when you want to send mails) that your IP has
> a sane PTR and that the name maps back to the IP the dns system couldn't
> care less
My thoughts exactly. They can technically be different and the DNS=20
itself indeed couldn't care less (but applications checking for that=20
might).. but would it make sense to? I mean yeah I suppose that they can=20
exist without the other. Not uncommon for A records to be without PTR=20
records, and I guess that a PTR record without an A record could work=20
too..? But again, aside from the theoretical possibility, why would you=20
want to set your PTR records to not match at least one of your A records?
--=20
Met vriendelijke groet / Best regards,
Michael De Roover
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