Multiple PTR or not?
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Thu Aug 8 21:32:04 UTC 2002
>
> % to me this doesn't seem logical. two domains using the same address
> % space. The primary dns server will actually function as
> % dns.beth.k12.pa.us and ns.bethsd.org.
> %
> % -- im trying to measure twice and cut once :)
> % any advice you guys could give me would be helpful.
> %
> % --j
>
> you can code multiple PTRs. e.g.
>
> dns.beth.k12.pa.us. in a 192.0.2.10
> ns.bethsd.org. in a 192.0.2.10
> ..
> 10.2.0.192.in-addr.arpa. in ptr dns.beth.k12.pa.us.
> 10.2.0.192.in-addr.arpa. in ptr ns.bethsd.org.
>
> however...
> As mark and others have told you, nearly every application will
> only use the first PTR they get.
>
> So, for your purposes, code both all three zones, with the 2.0.192.iaa
> zone having multiple entries. When you are comfortable w/ the DNS
> working properly (zones load w/o error, proper answers are given) then
> you can start removing the older PTR entries
>
> At least this is how I understand the situation as described.
> YMMV
>
> --bill
>
And if you use two PTR records you have to add *both* names
to anything using name based access control. That is probably
the biggest reason to use only one and to be consistant about
the suffix.
Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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