Reverse DNS problems

[Mark Andrews]

> 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.

	This is a RFC 2317 style delegation.

	Rename your 171.135.206.in-addr.arpa zone to be
	0-26.171.135.206.in-addr.arpa.  You may need to
	fix zone contents.

	Become a slave for 171.135.206.in-addr.arpa.
 
> 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.

	You need to get the host record removed.  You need to
	contact your registrar, Network Solutions, to do this.

horogw.suemills.com.    172800  IN      A       64.218.226.140
suemills.com.           172800  IN      NS      horogw.suemills.com.
suemills.com.           172800  IN      NS      hydrogen.suemills.com.
;; Received 122 bytes from 192.5.6.30#53(A.GTLD-SERVERS.NET) in 243 ms


> 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