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Exchange 2007 with Relay setup with 2 IP's and 1 NIC, which IP is send connector using?

I have SBS2008 and Exchange 2007 on x.x.x.10
I have the standard setup to allow certain IP's on the LAN to relay through a second IP x.x.x.11, I have some LAN IPs set to require Authorization and other LAN IP's for No Authorization required.
The x.x.x.11 is simply a second IP on the same NIC that x.x.x.10 was setup on.
The router is set to allow port 25 through to x.x.x.10
All is working fine.

I have been wondering for a while which IP is the send connectors using x.x.x.10 or x.x.x.11?

I have a feeling it uses the x.x.x.10, the lower numbered IP, but there don't seem to be any settings to define which the send connector uses. I have had a look for guidance but haven't found anything relevant.
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davidfrank
Asked:
davidfrank
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1 Solution
 
Robby SwartenbroekxMSP engineerCommented:
it uses the default ip on a given network card.
as I read your question correctly, that would be x.x.x.10
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davidfrankAuthor Commented:
Agreed, had a listen on Wireshark, though if the secondary IP is a lower number it looks like this becomes the default for exchange.
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davidfrankAuthor Commented:
Clear to the point, thanks.
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