How to create two seperated DSL connections and use them for different subnets

view full story

http://askubuntu.com – First excuse my bad english please. My Problem is, that, with my internet provider(Alice DSL) i have two PPPOE connections, one for "ordinary internet" and one for Voip. My Question is how can i create two connections and tell ubuntu to send voip data via the first connection and use the second connection for "ordinary internet"? I do not want to bundle them, and i do not want to make failover I would be glad if someone has a solution to my Problem (HowTos)