I have a set of PCs running a certain business application that needs to send/receive data through 2 different lines, however each PC has only 1 network card which was initially configured to connect to a private network via a dedicated line (leased line), the NIC is configured to have static TCP/IP values (IP, gateway, DNS of that private network). Recently, we have installed a new broadband router which is meant to be connected to those PCs as the second connection. The router is connected to a local ISP on WAN port and to the aforementioned PCs network (switch) on one of the LAN ports.
Now the question is: How to configure the NIC to forward traffic to different lines according to traffic type; i.e. http traffic goes through the broadband router and all other traffic goes through the leased line?