Load sharing network

[neutec]

Hello All,
Im running potato with kernel 2.2.15. I have three nic card installed(two for 
DSL connection and the other for Lan connection). I want to load balance 
between the two DSL lines. And if one connection fails the network switches 
over to the other connection. Where can I get information on this. I cant find 
anything in the Howto's.
Thanks
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