This guide will explain how to setup OpenVPN in a way such that only select programs will be able to use the VPN connection while all other life continues as usual. Please read this notice before applying the guide
Advantages:
fail-free "kill switch" functionality (actually better than 98% of VPNs out there)
continue using another VPN as primary or don't reroute any other traffic at all
nobody, not even peers on LAN, will be able to connect to your torrent client (the only