Networking in Linux - A Detailed Guide to VPN Kill Switches In the previous guide in our Networking in Linux series, we followed a packet through a VPN tunnel and saw how WireGuard encrypts and encapsulates our traffic before sending it over the physical network. But what happens if the VPN connection suddenly goes down? Under normal circumstances, Linux can reach the internet through our physical network interface. If the VPN tunnel disappears, what's stopping Linux from simply using that interface again and sending our traffic outside the VPN? That's where a VPN kill switch comes in. In this final part of our Networking in Linux series, we'll explore how Proton VPN's Standard Kill Switch works under the hood. We'll examine Linux network interfaces and routing tables to understand what happens when the VPN server becomes unreachable, when the tunnel interface disappears unexpectedly, and when we intentionally disconnect from the VPN. Learn more in this guide: blog.sysxplore.com/p/ep4-net…