Routing Traffic Depending On Destination Port

[borlafu 0]

A friend has a little problem and I don't know how to solve it. He has 2 ethernet cards on his PC, each one of them connected to a different router with different ADSL connections (quite strange, I know hehe).He want's to use one of the connections for p2p traffic and some downloads and the other one to surf the Internet, check his email and online gaming.I don't know how to route traffic trough the correct interface depending on that criteria... it would be easier if the inferface just depended on the destination IP, so he could configure it on the routing tables, but I have no idea about how to solve this problem...Any ideas? Maybe there is an easy-to-use program that can route the connection depending on the application that requested it...Thx