Reverse DNS problems
Mark Andrews
Mark_Andrews at isc.org
Fri Mar 19 21:02:10 UTC 2004
> First:
> Domain servers in listed order:
> HYDROGEN.SUEMILLS.COM 206.135.171.2
> HOROGW.SUEMILLS.COM 64.218.226.140
>
> Goto networksolutions and login to your dns management and delete the
> host HOROGW.SUEMILLS.COM (or whatever they require you to do) and you
> need to add a second server for redundancy. (FWIW, your ISP is correct in
> saying they can't do it)
>
> Next:
> 2.171.135.206.in-addr.arpa.
> alias = 2.0-26.171.135.206.in-addr.arpa.
> 2.0-26.171.135.206.in-addr.arpa.
> host = hydrogen.suemills.com.
>
> This should simply be:
> 2.171.135.206.in-addr.arpa.
> host = hydrogen.suemills.com.
You are *wrong*. Go read RFC 2317 to understand what is
being done here.
> Then:
> 3.171.135.206.in-addr.arpa.
> alias = 3.0-26.171.135.206.in-addr.arpa.
> 3.0-26.171.135.206.in-addr.arpa.
> host = radon.suemills.com.
>
> This is your mx record which there again should simply be:
> 3.171.135.206.in-addr.arpa.
> host = radon.suemills.com.
Again you are wrong.
> No 'alias' records ...
>
>
> On 17 Mar 2004 at 16:38, John Emery wrote:
> To: comp-protocols-dns-bind at isc.org
> From: John Emery <nospam_john_nospam at suemills.com>
> Subject: Reverse DNS problems
> Date sent: Wed, 17 Mar 2004 16:38:38 -0800
> Organization: Epoch Internet
>
> > I'm trying to figure out why I can't modify the host lookup for our
> > primary mail server. I have a revserse lookup file. Any machine
> > pointing to our primary DNS server can do a reverse lookup on the mail
> > server:
> >
> > # dig -x 206.135.171.3
> >
> > ; <<>> DiG 9.2.2 <<>> -x 206.135.171.3
> > ;; global options: printcmd
> > ;; Got answer:
> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61947
> > ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
> >
> > ;; QUESTION SECTION:
> > ;3.171.135.206.in-addr.arpa. IN PTR
> >
> > ;; ANSWER SECTION:
> > 3.171.135.206.in-addr.arpa. 10800 IN PTR radon.suemills.com.
> >
> > ;; AUTHORITY SECTION:
> > 171.135.206.in-addr.arpa. 10800 IN NS hydrogen.suemills.com.
> >
> > ;; ADDITIONAL SECTION:
> > hydrogen.suemills.com. 86400 IN A 206.135.171.2
> >
> > ;; Query time: 2 msec
> > ;; SERVER: 206.135.171.2#53(206.135.171.2)
> > ;; WHEN: Wed Mar 17 16:27:43 2004
> > ;; MSG SIZE rcvd: 139
> >
> > #
> >
> > You'll notice that the Answer section gives "radon.suemills.com"
> >
> > But, if I use an outside DNS server:
> >
> > # dig @205.214.45.6 -x 206.135.171.3
> >
> > ; <<>> DiG 9.2.2 <<>> @205.214.45.6 -x 206.135.171.3
> > ;; global options: printcmd
> > ;; Got answer:
> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3955
> > ;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
> >
> > ;; QUESTION SECTION:
> > ;3.171.135.206.in-addr.arpa. IN PTR
> >
> > ;; ANSWER SECTION:
> > 3.171.135.206.in-addr.arpa. 14400 IN CNAME
> > 3.0-26.171.135.206.in-addr.arpa.
> >
> > ;; AUTHORITY SECTION:
> > 0-26.171.135.206.in-addr.arpa. 14400 IN NS horogw.suemills.com.
> > 0-26.171.135.206.in-addr.arpa. 14400 IN NS hydrogen.suemills.com.
> >
> > ;; ADDITIONAL SECTION:
> > horogw.suemills.com. 67869 IN A 64.218.226.140
> > hydrogen.suemills.com. 67869 IN A 206.135.171.2
> >
> > ;; Query time: 76 msec
> > ;; SERVER: 205.214.45.6#53(205.214.45.6)
> > ;; WHEN: Wed Mar 17 16:29:06 2004
> > ;; MSG SIZE rcvd: 153
> >
> > #
> >
> > The Answer section gives "3.0-26.171.135.206.in-addr.arpa." as the host
> > name.
> >
> > I'm having trouble sendin email out from this machine, to some domains,
> > as they require a valid reverse host lookup.
> >
> > I called our ISP, and they say, the reverse authority has been deligated
> > to our primary DNS servers. If I need anything changed, in the reverse
> > zone, that is of course, my responsibility. AND, if I need any reverse
> > lookup, authoritative DNS servers removed, or updated then I need to
> > contact network solutions to do this. My ISP won't help past this point.
> >
> > If you notice, the "Additional Section" in the output of the second dig
> > command there are 2 NS servers listed; horogw, and hydrogen.suemills.com.
> >
> > Well, horogw is no longer a valid host, nor is the IP one of ours.
> > Since I can't think of anything else, seems to me that having this
> > invalid host in the list could be causing the problem.
> >
> > So, how do I get this host removed from the list? How do add a new host
> > name and IP to replace it as a backup? Could this be causing my reverse
> > lookup problems?
> >
> > Thanks in advance for reading and, hopefully responding to this posting.
> >
> > John Emery
> >
> >
> >
>
>
>
>
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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