The topology subnet

The topology subnet #

When using –topology subnet, a single Ip address and netmask are assigned to the tun interface, with no peer address specified.

It is possible to use this topology option to make the tun style point-to-point setup almost exactly the same as the corresponding tap style setup.

1. Start the first endpoint in the listening mode

   openvpn --ifconfig 10.200.0.1 255.255.255.0 --dev tun --topology subnet
   

2. launch the OpenVPN client

   openvpn --ifconfig 10.200.0.2 255.255.255.0 --dev tun --topology subnet --remote first.endpoint
   

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