This ensures that even if the F5 client leaks DNS, queries cannot reach the physical interface’s DNS servers. 7.1 "TLS handshake failed" Cause: OpenSSL version mismatch (3.x vs 1.1). Fix: Install OpenSSL 1.1 compatibility layer:
#!/bin/bash # Create isolated namespace sudo ip netns add vpnspace sudo ip netns exec vpnspace ip link set lo up sudo ip link set f5tun0 netns vpnspace Run browser only inside namespace sudo ip netns exec vpnspace sudo -u $USER firefox
sudo apt install libssl1.1 sudo ln -s /usr/lib/x86_64-linux-gnu/libssl.so.1.1 /usr/local/lib/libssl.so Cause: Kernel module tun not loaded or permission issue. Fix: