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Tailscale (also using wireguard for transport) and similar overlay networks kind of do that.

With Tailscale there is a central server, you can sign in with single-sign-on, that server enables automatic mesh configuration and helps nodes communicate specifics for port knocking, routing, dns, etc. And there are derp servers (think of them like TURN servers) that can be used as proxies when direct communication can't be established.

Altogether this is easier to set up than Wireguard, but the central server is not open source (but there is Headscale, and open source implementation), and it is not as well supported on routers (it is supported on OpenWRT though and probably can be set up using containers on Mikrotik).

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irunmyownemail 9 hours ago | parent [-]

With Wireguard I own or control everything. Why would I surrender any of that to Tailscale?

	▲	Jnr 6 hours ago \| parent [-]
		Would be great if someone made something with the polish of Tailscale and made it completely free and open source, but I don't think it is happening any time soon. Wireguard itself has been an unbelievably great gift to the whole IT ecosystem and Jason will forever be cemented in my hall of fame. But he did intend for Wireguard to be used in all sorts of solutions and Tailscale is one of them. Tailscale apps themselves are open source for open source platforms (linux, android) and the 3rd party management server Headscale is open source, enabling you to maintain control.