The Invisible Threat: Network Flapping
Your physical internet connection is rarely 100% stable. Wi-Fi signal interference, microwave reflections, laptop sleep/wake events, or cellular base station handovers cause micro-disconnections every day. When your VPN tunnel encounters a temporary disruption, what does your operating system do?
By default, Windows, Android, macOS, and Linux are engineered to keep you connected to the internet at all costs. The OS instantly re-routes outgoing traffic over your unencrypted default gateway—exposing your real geographic location, IP address, and DNS lookups in milliseconds.
How a Real Kill Switch Works: Fail-Closed Design
A true VPN Kill Switch enforces a Fail-Closed Security Posture. Rather than passively waiting for the VPN app to notice a failure, it establishes hard OS-level firewall rules:
// Paben VPN Windows Filtering Platform (WFP) Logic
RULE 1: Allow outbound packets to VPN Gateway (156.67.xxx.xxx:51820)
RULE 2: Allow all traffic traversing virtual interface (WireGuardAdapter)
RULE 3: BLOCK ALL other outbound IPv4 & IPv6 traffic (Default Deny)
Because rule #3 blocks everything by default, even if the VPN daemon crashes or your Wi-Fi resets, not a single unencrypted packet can escape your machine.
Frequently Asked Questions
Does the Kill Switch disconnect my local printer or LAN?
By default, smart Kill Switches support LAN Bypass, allowing local network devices (printers, local NAS servers on 192.168.x.x) to remain accessible while blocking public internet leaks.
How can I test if my Kill Switch is working?
Connect to your VPN, start a continuous ping (`ping -t 1.1.1.1`), and forcibly disconnect your router's ethernet cable or terminate the VPN process. The ping should immediately show `Request timed out` rather than resolving through your local IP.
Automated Kill Switch Included in All Paben Plans
Activate total fail-closed protection on Windows, Android, and macOS with 1 click.
Start 7-Day Free Trial →