Yes, this is possible if I understand what you are saying. People do this all the time, in lieu of a hardware router/gateway. Essentially, you are using your PC with 2 NICs as the gateway. You have to setup your 2nd NIC so that it sees the 1st NIC as a gateway. And the 2nd should be static, but as long as it has the internal address of the second as a gateway, then you should be able to see the 'net' with the sencond.
-Michael
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