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Exchange 2010 using replication network for outgoing mail??

Posted on 2013-12-18
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Last Modified: 2014-01-03
I have an Exchange 2010 server at my DR site. It sends outoging mail to a smarthost, let's call the smarthost zix1.

Outgoing mail is not working. Mail vendor says the smarthost is fine. My firewall vendor does not see any traffic coming from my Exchange server at 10.10.10.205, which is the MAPI network IP address.

I did a pathping to zix1 and it's showing the replication network IP address of 10.10.10.204.

Seems like my Exchange server is trying to send out mail or communicate outside with the replication network - is that possible? ANy ideas how to fix it??
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Question by:cb_it
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by:Simon Butler (Sembee)
ID: 39728125
The only reason would be a default gateway configured on that network. Do you have one set?

If so, remove it and use the route command to configure a route for the DAG network instead.

Simon.
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by:cb_it
ID: 39729092
There is a default gateway set on the replication network, I'm not sure if it's always been there or not. Someone else set this server up.

We did have an ISP outage at this location last week. Does Exchange make changes to the network on its own? For example if it cant send mail out one way it will try another network? Could Exchange have automatically added in that default gateway??
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Simon Butler (Sembee) earned 500 total points
ID: 39729646
You shouldn't have two default gateways on the server, so I would take the other one off. It is probably only worked that way because the first one worked.

It isn't Exchange doing the routing, but Windows.

Simon.
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