I want to connect 2 (or more) Windows XP computers from different networks to a mutual virtual network. Also I have a VPS with a modern linux distribution with a public IP. I want to install some VPN software on both clients (Windows XP PC) and the server (VPS).
I've tried installing IPSec server on the VPS, but the problem is that I've faced with config editing in order to use obsolete cryptographic algorithms on the VPS. Also I've managed to run the VPN using older versions of the OpenVPN. But the network wasn't stable, sometimes the connection inside the tunnel could disrupt.
Do you know some Windows XP software that I will be able to install in 10 years from a
.msi file? Maybe there are existed some software which creates VPN tunnel using one port SSH-forwarding (using Putty for example). Another idea was using some hardware solutions, for example I could buy 2 mikrotik routers and connect them to the VPN using the modern versions of the protocols.
In past I remember I was using hamachi. But I'm not sure if it's still supporting Windows XP and it depends on hamachi's servers.