[ubuntu] Change network device for default inet gateway?

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http://ubuntuforums.org – I've been struggeling with this for a few hours now, googleing and so on trying to find an easy way to just switch which device I want as primary for internet connections. After long battles I'm at a loss, this is the current automatic routing Code: Kernel IP routing table Destination    Gateway        Genmask        Flags Metric Ref    Use Iface  U    1      0        0 eth0    (HowTos)