How to choose which modem DSL uses?
 

Currently I have a linux box with 3 network cards. It's routing/load balancing my traffic for me on two DSL lines. Currently I've shutdown the box. As a temporary solution I've plugged one of the modems directly into the network hub. Then started to think...

If I plug both modems into the network directly, is there any way to tell pppoe which modem to use? This would eliminate the need for me to have 3 network cards in the linux box.