Split Routing in MacOSX

At long last I’ve managed to configure dual network interfaces on my mac.  With the help of split-routing and Alberth Matos, I’ve managed to get two interfaces working simulataneously.

Interface 1: Airport Extreme (my fast internet connection)
Interface 2: Gigabit Ethernet (for lan connections)

The order of the interfaces is set in the Network Preferences as above.

Each interface is configured as it would be to access its respective network.  DNS for the local network is entered in both configs and the following command is used to configure the routing table:

sudo route add 10.0.0.0/8 10.2.204.20

Where 10.0.0.0 is the local netmask and 10.2.204.20 is the local router address.

The route tables need to be updated upon network location change or reboot.  I’m now investigating the best way to handle this.