Notice to my future self:
- an openvpn connection can be stablished between client and server
- you can ping the server from the client
- you can ping the client from the server
- you added the route in your server config
- route -n shows everything is in place
- but you can not ping any host on an attached network
… then you forgot to add a file in the ccd-directory for the correct common name of your client containing all iroute statements.