Best Way to Set Up ISP/WAN Failover?

[rcrcr]

What might be the best way to implement the following scenario…

A Mac OS X Server box with three ethernet interfaces connected to two WAN gateways on separate interfaces, let’s say as follows:

en0 WAN ISP 1
en1 WAN ISP 2
en2 LAN

All WAN traffic routes over the en0 gateway unless ISP 1 goes down or otherwise becomes unavailble, in which case all WAN traffic routes over the en1 gateway.

If the default route is the en0 gateway, is it possible to simply statically add a second default route to the en1 gateway? If so, which default route would take precedence?

Is there a better way to approach this?

rcrcr

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