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I'm using Ubuntu Network Manager VPN client to connect to a PPTP vpn server.
I have an application that get some data from internet and must be runned from behind the VPN.
I need to suspend application process if VPN connection dropped.
How can I find out the VPN is connected/disconnected (script or command)?
Or is there a service that be able to call an script when VPN connected/disconnected?

Thanks

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    You can ping your VPN gateway. So, if your gateway on the VPN is 172.16.1.1, the exit status of ping -c 1 -W 10 172.16.1.1 will tell you if you're connected. – Shawn J. Goff Apr 17 '12 at 11:57
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TorrentFreak had an article about things like that.

You could check out VPNCheck.

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I wrote something awhile back that keeps an eye on your IPs using a couple of different methods and gives some options for notification and such. It was written for CentOS but it wouldn't take much to adapt it to Debian flavours. Feedback is welcome.

http://code.google.com/p/ipcheck/source/browse/ipcheck.sh

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