Routing

As stated before, the main use case for point-to-point style networks is to connect two remote networks over a secure tunnel. In the previous example, the secure tunnel was established, but no network routes were added.

For the next example, consider the following network layout:

The client-side network 192.168.4.0/24 (with netmask 255.255.255.0) needs to be routed over the VPN tunnel to the server.

On the listening end (server), we start:

[root@server] # openvpn \
    --ifconfig 10.200.0.1 10.200.0.2 \
    --dev tun \
    --secret secret.key 0\
    --route 192.168.4.0 255.255.255.0 \
    --daemon --log /var/log/movpn-02-server.log

On the client side, the code is as follows:

[root@client] # openvpn \
    --ifconfig 10.200.0.2 10.200.0.1 \
    --dev tun \
    --secret secret.key 1\
    --remote openvpnserver.example.com \
    --daemon --log /var/log/movpn-02-client.log

On the server side, a route statement was added to tell OpenVPN that the network 192.168.4.0/24 is found at the other...