Kill Switch Testing

Kill switch testing is the practice of verifying that your VPN’s kill switch actually prevents traffic from leaking when the tunnel drops. Many users enable a kill switch but never confirm it works under real conditions. A good test is to start a continuous network activity (streaming, a large download, or a ping) while connected to the VPN, then force a disconnect - by toggling the VPN off, changing networks, or temporarily blocking the VPN process - and observe whether traffic stops immediately. You should also test reconnect scenarios: sleep/wake on a laptop, switching Wi-Fi networks, and toggling airplane mode on mobile. If traffic continues for even a few seconds, you may be leaking your real IP and DNS. Some clients offer “always-on” modes that are more reliable than app-level switches. On Windows and Linux, firewall-integrated kill switches tend to be strongest. In DVPN apps, testing is still essential because routes can change; ensure the client blocks traffic until the new secure path is established. Document your settings so you can re-check after updates. Kill switch testing is a practical step that turns “claimed privacy” into verified privacy.

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