Reverse DNS problems

John Emery nospam_john_nospam at suemills.com
Thu Mar 18 00:38:38 UTC 2004


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


More information about the bind-users mailing list