Implementing a kill switch on Android ensures that your internet traffic is blocked if your VPN connection drops, preventing accidental exposure of your real IP address. This guide focuses on configuring a robust kill switch using Android's built-in features and common VPN protocols.
Android offers a built-in kill switch feature that works with VPN apps.
Enable "Always-on VPN": Go to Settings -> Network & Internet -> VPN. Select HideIPVPN. Toggle "Always-on VPN" to ON.
Enable "Block connections without VPN": With "Always-on VPN" enabled, a "Block connections without VPN" option appears. Toggle it to ON. This will prevent any internet traffic when the VPN is disconnected.
OpenVPN Connect provides its own kill switch functionality.
Enable "Seamless Tunnel": In OpenVPN Connect, go to Settings. Find the "Seamless Tunnel" option and enable it. This feature blocks all traffic when the VPN connection is not active.
Verify Configuration: After enabling "Seamless Tunnel", confirm that internet access is blocked when you manually disconnect from the VPN or simulate a connection drop (e.g., airplane mode).
WireGuard's configuration allows for a kill switch implementation using the AllowedIPs parameter.
Configure AllowedIPs: In your WireGuard configuration file, ensure that the AllowedIPs parameter in your peer configuration ONLY includes the VPN server's IP address and the VPN subnet. Do NOT include 0.0.0.0/0 or ::/0.
[Peer]
PublicKey = <VPN Server Public Key>
AllowedIPs = <VPN Server IP>/32, <VPN Subnet>/<Subnet Mask>
Endpoint = <VPN Server IP>:<VPN Server Port>
Example: If your VPN server's IP is 203.0.113.5 and the VPN subnet is 10.6.0.0/24, the AllowedIPs line should be: AllowedIPs = 203.0.113.5/32, 10.6.0.0/24
DNS Configuration: Ensure your DNS server is also tunneled through the VPN. Specify the VPN provider's DNS server or a privacy-focused DNS server within the VPN subnet.
Even with a kill switch, DNS leaks can reveal your real IP address.
Use VPN Provider's DNS: Configure your VPN client to use the DNS servers provided by HideIPVPN.
Private DNS (Android 9+): Go to Settings -> Network & Internet -> Advanced -> Private DNS. Select "Private DNS provider hostname" and enter the hostname of a trusted DNS server (e.g., dns.hideipvpn.com).
Test the Kill Switch: Manually disconnect from the VPN or enable airplane mode to simulate a connection drop. Verify that internet access is completely blocked.
Firewall Apps: Ensure that any firewall apps you are using do not interfere with the VPN connection or kill switch functionality.
Battery Optimization: Disable battery optimization for your VPN app to prevent Android from killing the VPN process in the background.
Enabled "Always-on VPN" in Android settings.
Enabled "Block connections without VPN" in Android settings.
Configured AllowedIPs correctly in WireGuard (if applicable).
Verified DNS leak prevention.
Tested the kill switch functionality.
Disabled battery optimization for the VPN app.