Can I route add automatically when a network interface is added? Every morning, I connect my MacBook to my company network with the Apple USB Ethernet Adapter:



Then open the Terminal to add routes in order to access intranet servers:

 $ sudo route add -net 192.168.21.0/24 192.168.8.8
 $ sudo route add -net 192.168.22.0/24 192.168.8.8
 $ sudo route add -net 192.168.23.0/24 192.168.8.8


Is there a way that triggered by a new network interface (with a certain name) is added, then auto run the above route add commands?
Sidekick will do this for you: http://oomphalot.com/sidekick/