VPN Guide
What Is a Kill Switch?
What's happening
You've seen kill switch listed as a VPN feature. You're not sure if you need it or what it does.
Your VPN has a kill switch setting. It's off by default. You're not sure if you should turn it on.
You turned it on. An app stopped working when the VPN dropped. You're not sure if that's the kill switch working or a problem.
What people assume
Most people assume a kill switch is an emergency feature — something only relevant in extreme situations. It isn't. It's a failsafe for a gap that exists in normal use: the moment between a VPN dropping and reconnecting, during which your real IP is exposed. How often that gap matters depends entirely on what you're doing when it opens.
Most people assume a VPN connection is continuous. It isn't. VPN tunnels drop — due to network changes, server issues, or packet loss. Without a kill switch, traffic continues over the unprotected connection until the VPN reconnects. With one, traffic stops entirely.
Most people assume turning on the kill switch causes problems. It can — apps that don't handle a sudden network interruption gracefully will fail when the VPN drops. That's the kill switch working as intended. Whether the tradeoff is worth it depends on what the exposure would cost.
What's actually going on
A kill switch closes the gap that exists every time a VPN reconnects. For most users, that gap is low-stakes. For some — torrenting, sensitive logins, work in restricted environments — that brief window of real IP exposure is exactly what they're trying to prevent.
Whether to use it is a question about what the cost of exposure is during a reconnect. Not a question about whether the VPN is trustworthy.
Where this leads
If the concern is exposure on untrusted networks — cafés, hotels, anywhere you don't control the network — a kill switch closes the window where your traffic is briefly unprotected. See how network-level exposure gaps work
If the concern is torrenting — where peer-to-peer connections continue after a VPN drop, exposing your real IP to the swarm — a kill switch is more directly relevant. See how kill switch fits into torrenting exposure
If the concern is work sessions — tools dropping when the VPN reconnects, interrupted calls — the kill switch behaviour interacts with how the provider handles reconnection. See how VPN interruptions affect work sessions
If the concern is high-sensitivity financial access — a login you can't afford to have associated with your real IP — the kill switch addresses a specific window of risk. See how exposure risk works with financial access
No guarantees
A kill switch doesn't prevent VPN drops — it limits their impact. If the VPN is dropping frequently, the kill switch is managing a symptom, not the underlying problem.
Kill switch implementations vary. System-level kill switches block all traffic. App-level ones only block specific applications. The scope matters for what it actually protects.
A kill switch that fires constantly is a sign that the VPN connection is unstable. The right response is diagnosing the instability — not turning the kill switch off.
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