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 From:  Tim Brewer <T dot Brewer at beth dot school dot nz>
 To:  "'m0n0wall at lists dot m0n0 dot ch'" <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Sending Email from m0n0 lan to m0n0 lan - sort of
 Date:  Fri, 22 Jul 2005 16:25:14 +1200
Weird Question - may not neccesarily be to do woth m0n0wall, but would
GREATLY appreciate any help!
 
I have searched the mailing list, but no seems to have exactly what we do.
We have multiple external ip addresses and websites, and our setup as is
follows
 
 
internet -- router -- mono1 192.168.11.1/24 --packetcshaper -- LAN1
                                                                --
(192.168.11.10) SME ServerA (10.0.0.10) --- LAN2 -- (10.0.0.5) Exchange Mail
Server
                                                                --
(192.168.11.10) mono2 (10.0.0.1) --- LAN2
              
                                                                --
(192.168.11.50) SME ServerB
                                                                --
(192.168.11.55) IIS Web Server
 
I have set up mono1 rules/nat/proxy arp so incoming traffic from the
internet (http, smtp, vpn etc) all works fine.
I have set up mono1 as a DNS forwarder with www.a.b.c <http://www.a.b.c>
for websites on the SME ServerB and IIS Web Server so anything that is
behind mono1 can access them.
Our email comes through mono1, gets nat'd to SME Server A, which then passes
it onto Exchange Mail Server - this works perfectly.
The Problem:
SME Server B has it's own smtp server and sends out alerts to tech@a.b.c
<mailto:tech@a.b.c>  - these emails never get to Exchange mail Server.
If we set the alerts to go to another completely external domain (yahoo,
ihug etc) - it works fine.
From the logging on SME Server B, the email either appears to work, or get
the message 'Couldn't Establish an SMTP Connection'
We have tried making a test@test.a.b.c <mailto:test@test.a.b.c>  and
pointing this to a different external address, which then should (rules are
set up for this) through mono1then mono2 to Exchange Mail Server, but the
same issue.
It appears that for any domain we host ourselves, that we cannot email from
LAN1 to LAN2.
 
Thanks in advance
Tim Brewer
Bethlehem College
 

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