2 LAN ports - can I divide their tasks? 1 for internet one for LAN

I have a stand alone terminal server.. It has 2 LAN ports. I am currently getting internet and serving terminals through the same port. How can I route internet through the other port? I would Like to do this:

                              / PORT 1 - WAN
                              \ PORT 2 LAN
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This would be easy if your internet is on a different ip range. You can set the ip address and gateway on port 1 and set your lan ip address on port 2 with no gateway. Since port 2 is intended for LAN only, your server will automatically use port 1 for internet.
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Windows Server 2008

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