Generally I’ve not interest in accessing the clients.
However, this time we’d like to be able to rdp to the roadwarrior.
I see where, on the road warrior connection we can add the local network for ipfire to access.
So I entered this: 192.168.1.0/255.255.255.0
But I’ve had no luck passing traffic through to the road warrior.
There is no IpFire/roadwarrior way to do that. You can use net-to-net OpenVPNs though, but I have only used that for ipfire-to-ipfire scenarios.
However OpenVPN in itself supports it, but you must hack the config yourself. A quick search yields this result: https://forums.openvpn.net/viewtopic.php?t=9080
It might be more fruitful to set up a net-to-net connection with the road warrior router though.
The default setting for IP’s for the OpenVPN clients is dynamic. If you want to apply firewall rules to OpenVPN clients you need to set up the Static Address Pools and you can then assign a fixed IP address for each OpenVPN client.
Once you have set up the Static IP address pool then you need to edit each client and the static IP radio button will now be present as @tphz showed it and you can then define the static IP for each client that needs it.
You will then need to re-install the conf file for each client that you have changed to a static IP