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I'm running OS X 10.8 and have Tunnelblick set up so I can connect to my OpenVPN server at home. I've also used this at $WORK in the past.

When I'm out and about and want to jump on a public network, I'd like to prevent any network traffic before the VPN is connected.

However, when connected to known "safe" networks, connections should be allowed without a VPN connection.

I think I can accomplish most of this with pre/post connect scripts in Tunnelblick, but that only works when the VPN connection is initiated. I need to hook in to the OS to have it automatically disable the blocks when connected to a whitelist of networks...

Any ideas?

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closed as off topic by Terry Chia, Adnan, TildalWave, NULLZ, AJ Henderson Jun 3 '13 at 12:45

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You can use ipfw and allow connections only from/to 127.0.0.1 and the IP address of your VPN provider. –  Adnan Jun 2 '13 at 9:36

1 Answer 1

up vote 3 down vote accepted

That's what I'm using Little Snitch for.

You can set up different profiles, so for instance you can create a profile for untrusted networks that only allows VPN traffic and is selected by default for unknown networks. Once the VPN connection is set up Little Snitch can automatically switch to a profile for trusted networks, allowing all traffic.

Of course you can create as many profiles as you want, allowing or denying any traffic you wish.

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This gets me most of the way there, thanks! –  Peter Loron Jun 3 '13 at 20:27

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