---------
|client0|------server0
|server1|
---------
    |
    |
client1


client0 gets pushed a route to the server0 LAN.
server0 Tunnel network: 10.8.0.0/24
server0 LAN: 192.168.22.0/24

server1 needs to push (i.e. connect) the server0 LAN to client1
server1 Tunnel network: 10.9.0.0/24

push "route 192.168.22.0 255.255.255.0"
push "route 10.8.0.0 255.255.255.0"

push route "192.168.22.0 255.255.255.0 10.8.0.1"