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VPN Kill Switch Basics
Keep traffic from leaking outside the VPN
This guide explains VPN kill switches: how to enable them in clients or firewalls, test for leaks, and set safe DNS to prevent traffic escaping when the VPN disconnects.
- vpn
- kill switch
- leaks
- dns
- privacy
Enable the kill switch
Turn on the client kill switch or configure firewall rules to block non-VPN traffic.
Lock DNS
Use VPN-provided DNS or set secure resolvers inside the tunnel.
Test for leaks
Disconnect intentionally and confirm traffic stops; check IP/DNS leak tests.
Auto-start and monitor
Set the client to start with the OS and alert on drop events.