Mailing List CGatePro@mail.stalker.com Message #103687
From: Urs Grützner <ugruetzner@ems.ch>
Subject: RDNS (Reverse lookup) failure
Date: Mon, 5 Nov 2012 17:07:40 +0100
To: CommuniGate Pro Discussions <CGatePro@mail.stalker.com>
X-Mailer: Apple Mail (2.1084)
We have changed our Internet provider, needed to change also the DNS authority and the IP's.

The new zone file on the Master DNS is ok, according to the rules.  

The name Server IPS on the Server are changed to the new provider.

Our server is behind a Firewall, with local IPs 10.0.88.100, 127.0.0.1,


The forward and reverse lookup for ems.ch, mail.ems.ch and the public IP 194.209.14.153 are OK (see lookups below)







Now we have the following problem:

When sending mails its not the IP of our server which is transmitted, but the IP of our Gateway. Of course the RDNS lookup will fail for servers, which perform this check. 


I do not know how this IP is forwarded with mail. How does the mail server get his own public IP? By checking the DNS?  I don't understand how the gateway IP is coming into the header


Any help is appreciated

Thanks

Urs


PS: Here is a mail I have sent from the concerned server ems.ch. One can see the gateway number as the origin, instead of the mail servers IP number



Von:  Urs Grützner <ugruetzner@ems.ch>

Betreff:  test WAN IP

Datum:  5. November 2012 12:47:33 MEZ

An:  Gruetzner Urs <ursg@mac.com>

Return-Path:  <ugruetzner@ems.ch>

Received:  from st11b01mm-smtpin208.mac.com ([17.172.48.39]) by ms02551.mac.com (Oracle Communications Messaging Server 7u4-26.01 (7.0.4.26.0) 64bit (built Jul 13 2012)) with ESMTP id <0MD0006J5JFCOZA1@ms02551.mac.com> for ursg@mac.com; Mon, 05 Nov 2012 11:47:36 +0000 (GMT)

Received:  from ems.ch ([194.209.14.146]) by st11b01mm-smtpin208.mac.com (Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTP id <0MD00043QJFAL170@st11b01mm-smtpin208.mac.com> for ursg@mac.com (ORCPT ursg@mac.com); Mon, 05 Nov 2012 11:47:36 +0000 (GMT)

Received:  from [10.0.99.54] (account ugruetzner [10.0.99.54] verified) by ems.ch (CommuniGate Pro SMTP 5.1.16) with ESMTPSA id 4681822 for ursg@mac.com; Mon, 05 Nov 2012 12:47:33 +0100




„Lookup“ wurde gestartet …


; <<>> DiG 9.6-ESV-R4-P3 <<>> ems.ch any +multiline +nocomments +nocmd +noquestion +nostats +search
;; global options: +cmd
ems.ch. 3600 IN MX 10 mail.ems.ch.
ems.ch. 3600 IN A 194.209.14.153
2012103001 ; serial
10800      ; refresh (3 hours)
3600       ; retry (1 hour)
604800     ; expire (1 week)
21600      ; minimum (6 hours)
)
mail.ems.ch. 687 IN A 194.209.14.153
ns1.ip-plus.net. 19862 IN A 164.128.36.34
ns2.ip-plus.net. 1833 IN A 164.128.76.39



„Lookup“ wurde gestartet …


; <<>> DiG 9.6-ESV-R4-P3 <<>> mail.ems.ch any +multiline +nocomments +nocmd +noquestion +nostats +search
;; global options: +cmd
mail.ems.ch. 657 IN A 194.209.14.153
ns1.ip-plus.net. 19832 IN A 164.128.36.34
ns2.ip-plus.net. 1803 IN A 164.128.76.39


„Lookup“ wurde gestartet …


; <<>> DiG 9.6-ESV-R4-P3 <<>> -x 194.209.14.153 any +multiline +nocomments +nocmd +noquestion +nostats +search
;; global options: +cmd
153.14.209.194.in-addr.arpa. 86400 IN PTR mail.ems.ch.



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