• linux
• multihome
• openvpn

Linux multihome openvpn

===Setup of OpenVpn on multihome box.=== Problem is Openvpn answers udp packets back using default Gw, and selects different ip than incoming ip.

1. OpenVpn: Bind to all interfaces.

   • Linux selects int/ip based on routing. Local gen packets select int before mangle can replace fwmark.

2. OpenVpn: Bind to lo:127.0.0.2, use nat to nat incoming on udp:1194 to 127.0.0.2.

   • Kernel bug ? Still selecting wrong source

3. OpenVpn: Multiple instances each bound to specific ext ip.

   • WORKS! but need separate subnet for each instance, thus client ip changes when re-connects.

   • Setup OpenVpn to add host routes as they activate ?