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I want to connect my family devices in a single network wherever they are with no/minimal extra software installing. The best solution I think is with VPN, but I don't want to use that VPN for browsing the web, just to connect this devices with each other and maybe RDP.
What I found right now is 2 solutions:
Microsoft Azure free Private Network to create personal VPN and connect these devices to it via built-in Windows and Android VPN provider (I don't know if this is how this works)
Using SoftEther to create a VPN server on my PC and connect those devices with the same built-in providers (similar to this but on personal device)
Where are the best solution for my situation or maybe a better and simpler one is available.
I'd recommend OpenVPN running on your router, and you can specify in the server networks to forward, preventing the VPN from being used for web traffic. Just an FYI: you'll be limited by the upload speed of the ISP plan the remote device is behind. If you don't have a static WAN IP from the ISP, you'll also need to purchase a DDNS subscription. – JW0914 – 2019-09-30T13:00:56.097