How to connect three LANs into one network?

Question

Computer networks

let's say there is lan1 computer 1 and computer 2
somewhere on another provider (via the Internet)
there is lan2 computer 1 and computer 2
somewhere on another provider (via the Internet)
there is lan3 computer 1 and computer 2
can these networks be connected into one to play old games like warcraft 3 over the net?
what ways do you know?

Answer 1

VPN? Hamachi can be used for implementation .

Answer 2

The answer to the question voiced in this vein is only one - it is possible.
And then the nuances follow from the specific requirements for the task.
In the simplest case, you can get by with setting up vpn connections of all your networks to one point, since even home soho soapboxes have built-in vpn client / server.
Some older games may require dancing with a tambourine. they may need some specific thing, for example, that all PCs be on the same l2 segment, otherwise the client will not see the server.
Again, it depends on "whether you have enough skill" to set up and maintain all this. You can go the other way and buy a subscription to a service like hamachi.

Answer 3

The so-called overlay network. One of its options is VPN. You can pick it up on working machines or on gateways, or use third-party services.

Answer 4

If we are talking about some not very large network, I would set it up on gateways. For a more serious issue, as already suggested - VPN