@Muktar10 

Hello, the Archer C20 V5 doesn't support any VPN server or VPN client settings, it only supports VPN Passthrough by default settings, while it can work with those VPN client applications such as NordVPN, just ensure it connects to the internet fine, then you can use NordVPN software within the C20 network. No settings are required on the C20, it just needs to connect to the internet and you can install the NordVPN on your own clients.