TomatoUSB

I have two internet connections. Connection A is slow but unlimited while Connection B is fast but has a limit.

I would like to make use of tomato's load balancing capability. What I want is for the less bandwidth consuming activities (e.g. web browsing, facebook app, etc.) to use Connection A. All bandwidth extensive activities (e.g. Skype, Youtube, Viber, Facebook Messenger) should use Connection B.

I see Tomato has a feature called "Multiwan Routing" but I have no idea how to set it up to achieve what I want.

Please help! Many thanks.

:-)