Heres the answer
Check what routes are setup on your pc. Go to the command prompt and enter
"Route Print" this will display how your PC decides where to send network
requests. You will probably find two entries for destination 0.0.0.0 (The
rest of the world basically) one bound to NIC A ip address and the other on
NIC B. Now look at the metric column, this is "simplistically" a preference
(the lower the better).
So to summarise, if you modify your routing table to have a 0.0.0.0 route on
NIC A with a lower metric than NIC B all your internet traffic should flow
via A. (However should A fail then it would use B instead)
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