SIMS from behind NAT router

[George Macomber]

I recently replaced a quadra 950 running IPNetrouter and SIMS (8b9d12 
68K) with a G3 running SINS (8b9d14) behind a D-Link DI640. With the 
old system SIMS had the same network IP address as the public domain 
name. Nine users happily shared a single static public IP.

My server acts as a back up for one other SIMS server that handles mail 
for several domains. With the new setup, if my server tries to forward 
mail and fails to connect to the primary server it gets its own public 
IP address from DNS, connects and forwards the mail to itself about 20 
times. It then bounces the message.
"SYSTEM: The message has passed too many relays (hop counter is too 
big)"

The old system appeared to look up its own IP and stop there.

I seem to have found a work around. I replaced the domain names of the 
server that I am backing up with its IP# in the router.
BackedupDomain1.net=nnn.nnn.nnn.nnn.smtp
BackedupDomain2.net=nnn.nnn.nnn.nnn.smtp
BackedupDomain3.net=nnn.nnn.nnn.nnn.smtp
Where nnn.nnn.nnn.nnn is the same IP in each case.

This seems to work. Based on just one test. Am I asking for trouble in 
a way that I haven't foreseen? Is there a better solution?

Thanks and I have been reading the list for years but haven't had a 
problem I couldn't find in the archives in a couple of years.
George Macomber
Seawell MicroSystems    Seattle Washington

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