How do I run a script after connecting to a network?

I want to know how I would run a shell script after I connect to a network. For example, when my MBP wakes when I open it and it connects to my home wireless, I would like to run a script after it connects.

I would like to know how to do this in general for any script. However, my reason for wanting to do this now is because I am using hamachi as a vpn between computers and I have found that when my network reconnects after the os wakes, hamachi needs to be stopped and restarted in order to work properly.

Any info would help.

Thanks.

I assume, you are a terminal user.

add your script in your .bashrc and make it check whether your interface is up or down.

For eg,

ifconfig en0 | grep active (assuming you are in en0)

This is will report, whether the interface is up or not. You can add a conditional loop in addition, to your script in the .bashrc.

Post back your experiences or comments.