Comment 38 for bug 124663

Following up on MM's post above...

In 8.10 (and possibly otheres) there was a feature in Network manager to add subnets to force to use the vpn traffic. This works wonderfully for many situtuations (if you know all of the subnets you'll be using and don't have any duplicates). However in 9.04, this feature is gone (at this time).

Not sure if that confuses anything, but thought I'd throw it in!