I have 2 networks: Network A and Network B.
Network A is managed by myself, and I am free to do whatever I like.
Network B has an ISP that will not allow port forwarding or firewall changes.
In this scenario, I need to be able to remotely access a server on Network B, from Network A.
I've looked up VPN gateways, but most literature online is related to internet connection sharing, which is not what I'm after: I would like all computers and servers on Network B to connect to their own internet connection, but I would like a single server on Network B to expose it's RDP port over that VPN gateway.
I've taken a look at OpenVPN Access Server, but my line manager would prefer to not have to pay $150 annually for something that can be set up manually for free.
We are currently using pfSense for the VPN setup on Network A, and on Network B, the...