vpndemon - Monitor a VPN connection on Linux and kill a process upon disconnect

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VPNDemon monitors your VPN connection and kills a target program upon disconnect. It's the safest and easiest way to help prevent DNS leaks and enhance your security while connected over a VPN. Since the NetworkManager is being listened to, directly via the dbus-monitor, disconnect events are detected almost instantly. Likewise, the target process is killed almost instantly.

https://github.com/primaryobjects/vpndemon

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