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
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