Ross, I think you meant to say VPN.
The internet provided by your ISP gives you a dynamic IP address and that internet IP address will change. So that is a problem. You can buy from your ISP a static IP Address, business website or VPN etc. So knowing your internet WAN IP address changes, your not going to know what it is all the time. So the draw back to RDP, is what the heck is the IP address, now, few hours from now and tomorrow.
When you port forward for RDP to the PC you want to control, you not only have to setup that up in the router, that is a given, but you must find what the internet IP address of the router's WAN is. All the routers I have used has that information, look for WAN or Internet WAN either in the WAN setup or status page. Then remember that IP address may be different tomorrow. If you have a static IP Address then problem solved.
Once you know the current internet WAN IP address, you set your router to port forward the RDP port and directed that port to the PC IP address you want to control. Now to remote into it, put the router's internet IP address, just like you do now with your local network when you run RDP. Yep, that easy and it works just like it was on the local (home) network.
I haven't look but there are ways to find your internet IP Address. A service or DDNS service where you will run a client (app or program) that has a timed burst of information (packet of data) leaving your home network to a service that then knows your WAN IP address. So when you log into that service you can see what your home internet IP address is. I would think that some would let you login into it using it's IP address and then it will redirect that to your home internet IP address. You see this at work, Team Viewer, Splashtop (the one I use for internet), webcams, smart house login etc., these log into a service, the program inside the home network keeps a connection to that service so that server knows what your home internet IP address is all the time and directs your TV, Splashtop or webcam etc. to your home.
Splashtop is just install, create a login and its done. No router configure and simple to use. I am not a fan of Team Viewer.
Edited by GrandadCast, 20 November 2020 - 10:09 PM.