The ISP, as owner of the IP address they've given you to use, controls
the rDNS entry. You need to get them to change it to your host name.
There are rare situations where an ISP might delegate rDNS entries to a
customer, but I wouldn't count on that. I've also heard of situations
where the customer can use a web app to change their rDNS values. You'll
need to contact your ISP and see how they handle it. You can simply tell
them what you want it to be, and they should change it.
Maxwell Smart wrote:
OK I know that, but that doesn't resolve my problem. Without being able
to setup an rDNS entry for this IP address my server mail gets rejected
with a non matching rDNS entry. How is this resolved? I can't be the
only one that has a server at a co location facility where I don't
control the DNS.
Eric Shubert wrote:
Maxwell Smart wrote:
I have searched, but really don't know how to ask this question. I know
most on the list have been confronted with this. If anyone could point
me in the direction of the answer that would be sufficient.
I have a qmailtoaster that I just put into a co location facility. It
has rDNS pointed to it's domain name, as it's supposed to. How do I
setup my rDNS entries for mail clients on the server at that
location? Is there a way to use a PTR record that indicates that
it's supposed to
resolve to colo.example.com? What's the correct method of addressing
this?
CJ
There's only one rDNS entry for a given IP address. That entry should
be a ptr record that points to (some other) type A record that
hopefully resolves to the same address which the rDNS entry has.
For example:
shu...@edwin:~$ dig doris.shubes.net
; <<>> DiG 9.4.2-P2 <<>> doris.shubes.net
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4288
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;doris.shubes.net. IN A
;; ANSWER SECTION:
doris.shubes.net. 592 IN A 174.17.83.232
;; Query time: 0 msec
;; SERVER: 192.168.70.253#53(192.168.70.253)
;; WHEN: Tue Nov 3 19:55:59 2009
;; MSG SIZE rcvd: 50
shu...@edwin:~$ dig -x 174.17.83.232
; <<>> DiG 9.4.2-P2 <<>> -x 174.17.83.232
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38386
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;232.83.17.174.in-addr.arpa. IN PTR
;; ANSWER SECTION:
232.83.17.174.in-addr.arpa. 43031 IN PTR
174-17-83-232.phnx.qwest.net.
;; Query time: 0 msec
;; SERVER: 192.168.70.253#53(192.168.70.253)
;; WHEN: Tue Nov 3 19:56:38 2009
;; MSG SIZE rcvd: 86
shu...@edwin:~$ dig 174-17-83-232.phnx.qwest.net
; <<>> DiG 9.4.2-P2 <<>> 174-17-83-232.phnx.qwest.net
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59486
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;174-17-83-232.phnx.qwest.net. IN A
;; ANSWER SECTION:
174-17-83-232.phnx.qwest.net. 43010 IN A 174.17.83.232
;; Query time: 0 msec
;; SERVER: 192.168.70.253#53(192.168.70.253)
;; WHEN: Tue Nov 3 19:57:18 2009
;; MSG SIZE rcvd: 62
shu...@edwin:~$
HTH
--
-Eric 'shubes'
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