In this scenario, not quite, for a number of reasons:
- The VPN will encapsulate the traffic in a PPTP header, which Wanos will see at IP traffic that is not TCP or UDP
- The VPN may add encryption
- RDP may add encryption
The following scenario would be better:
pc -> wanos -> vpn -> internet -> vpn -> wanos -> server
In this case if RDP encryption is disabled, an attempt can be made to dedup and compress the traffic. pfSense may need to be configured to not drop IP Protocol 108.