networking - c++ Library for direct pc to pc communication in a Wide area network (WAN) -


the idea make connection between 2 pcs, each 1 internet access connect other. both pcs can in same lan or not, , or behind routers, main idea thing internet access.

first of all, question is: possible or exist kind of solution not include intermediates or route configurations allow direct communication between 2 pcs? (remember idea connect directly without external configurations, 2 places allowed configured both pcs communicate each other).

second question is: if possible, libraries or kind of solution suggest accomplish (a c++ way/library appreciated not mandatory)

thanks

in general, no, you're looking no longer possible.

whilst internet designed around "end-to-end communication", relatively dumb network in between nodes, what's happened more , more network devices in way.

in particular, nat devices make more or less impossible make direct point-to-point connections between arbitrary devices on internet.

hence systems these days rely on central device (to both nodes can connect) proxies (or relays) packets between nodes.


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