Automatic failover of two internet connections Mac OS X

Question

Is there any way to set up an automatic failover for internet connections within Mac OSX? Basically the main connection would be ethernet or wifi and if the main connection goes does, it would switch to a 3G mobile phone or another Wifi connection.

Answer 1

If one interface goes down physically (cable unplugged, no wifi signal) or has no DHCP information, Mac OS X will automatically fail over to the next active interface in the list in the Network preferences. You can change the priority using the “Set Service Order…” option in the action menu.

However, this does not care about failures which are lack of packets getting through. If that it your problem, maybe you could find or create a tool to automatically shut down the interface that is failing for a moment (such as by ifconfig en0 down); when it is brought up again it would fail to acquire a DHCP lease and so remain inactive until it is working again.