To demonstrate hole punching / NAT traversal using the TCP protocol.
UDP hole punching is more well known and TCP hole punching is less supported by different router models, so this is a proof of concept.
Run the Introducer executable on a publicy reachable server (e.g. an Amazon EC2 instance).
Run the Peer executable on both PCs you want to connect.
Use a service like cmyip.com to determine the public WAN IPs of each PC, and enter them in each Peer. Hit .
If the connection succeeds, then TCP hole punching just succeeded.
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