Re: How to route specific IP to specific protocol on VPN Tunnel
If your VPN is a site-to-site VPN (IPsec of course), the tunnel name already is a virtual interface to which you can route.
Create a new static route (Network>Static Routes), target network=192.168.20.0/24 (or even smaller like 192.168.20.21/32), interface=tunnel_name, gateway=(leave empty).
This particular setup works for IPsec VPNs, you don't have to specify a gateway address.
Then you need an outbound policy from LAN to tunnel, and of course the same on the other side.
Note that you cannot route just RDP traffic to the tunnel, and other traffic elsewhere. Wouldn't make much sense anyway.
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