rDNS

Bob Harold rharolde at umich.edu
Fri Jan 20 16:19:39 UTC 2017


On Fri, Jan 20, 2017 at 10:57 AM, Ron Wingfield <Ron.Wingfield at archaxis.net>
wrote:

> I am having difficulty configuring reverse DNS.  This has been a problem
> for over a year between my server(s) and my ISP, AT&T.  Specifically, I
> cannot  eMail to any recipient that requires rDNS verification, e.g.,
> SBCglobal.net, Comcast.net, or AOL.  Very frustrating.
>
> Two examples of dig:
>
> # dig -t mx alpha.archaxis.net
> ANSWER: 0, AUTHORITY: 1,
>
> Why does this first example, digging the FQDN of alpha.archaxis.net
> reports one authority but no answers?
>
> # dig -t mx archaxis.net
> ANSWER: 2, AUTHORITY: 0,
>
> . . .yet this second example. digging the FQDN of archaxis.net reports no
> authority but 2 answers?
>
> (The) ;; ANSWER SECTION: (of both examples) reports:
> archaxis.net.           10800   IN      MX      30 bravo.archaxis.net.
> archaxis.net.           10800   IN      MX      20 alpha.archaxis.net.
>
> In both cases, the reported server is an AT&T server ;; SERVER:
> 68.94.157.9#53
> . . .why shouldn’t this “point” to my server, 162.202.233.81 and not
> AT&T’s?
>
Just to clear up the confusion on this point:
dig is telling you that "SERVER: 68.94.157.9#53" is the DNS resolver that
your computer used to answer the DNS question.  That server is not part of
the answer to the question.


>
> I have coded my BIND 9 in-addr.arpa zone file as follows:
>
> $ORIGIN   233.202.162.in-addr.arpa.
> $TTL 3h
> @       IN   SOA      ns1.archaxis.net.  me.archaxis.net. (
>                           2017012002 <(201)%20701-2002>    ; Serial
>                                 1h      ; Refresh
>                                 1h      ; Retry
>                                 1h      ; Expire
>                                 1h )    ; Negative cashing TTL
>
>                 3600    IN   NS   ns1.archaxis.net.
>                 3600    IN   NS   ns2.archaxis.net.
>
> 80              3600    IN   PTR  network.archaxis.net.
> 81              3600    IN   PTR  alpha.archaxis.net.
> 82              3600    IN   PTR  bravo.archaxis.net.
> 87              3600    IN   PTR  broadcast.archaxis.net.
>
> What is wrong?  Is this my problem, or with AT&T?
>

-- 
Bob Harold
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