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You cant make a p2p connection over a NAT without exposing a port on the public side of the NAT.


Go check out STUN and ICE.

The best article I've found about NAT traversal is this article from Tailscale: https://tailscale.com/blog/how-nat-traversal-works


Not bad, though you don't even need STUN or ICE;

https://github.com/samyk/pwnat

https://github.com/samyk/slipstream


https://sendfiles.dev/


That uses WebRTC, which uses the same NAT traversal tricks.


is there a filesize limit for this?


You can: https://en.wikipedia.org/wiki/Hole_punching_(networking)


You aren't guaranteed to be able to do that but in practice most times you can.




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