Others chime in. Once you enable openvpn on the receiver your LAN IP no longer exists. Network traffic tunnels through your LAN to your ISP interface (Router>Cable modem/ONT) to the VPN server.
So your LAN address (ex: 192.168.XXX.XXX) would be changed to what the openvpn config file dictates.
In your receiver network settings you should see that info.
Although never having installed openvpn on my receiver, it is installed on my router. So my LAN stays intact.