Hey folks! First of all my desktop is running Ubuntu 18.10 Vanilla Gnome-Session and running stock 'UFW' firewall.
I occasionally use a VPN service when doing P2P and torrenting. A few days ago I left my deluge client up and seeding overnight, with the VPN connection active. In the morning I noticed the VPN had quit, but the connection remained up, and I was torrenting in the open fully exposed. Subsequently, I rec'd the dreaded ISP letter.
I had followed this tutorial to set up my firewall, with the expectation that if the VPN went down, so would my entire internet connection, thereby protecting me from being exposed. Unfortunately it didn't work.
Now, I'm not a sysadmin or network guru - so hopefully some expertise here could help with firewall rules that would prevent this from happening again. Suggestions gratefully excepted. Thank-you!