Hole Punch: UDP NAT Punching
(c) Chris Kennelly (chris@ckennelly.com)
Overview
This repository contains a simple example of UDP hole punching in C. It compiles to two binaries, a server that relays client information and a simple client that ping-pongs data to and from another instance of itself.
This protocol may fail when two clients are behind the same NAT and encounter a router that will not send packets to its own external IP address.
This example is licensed under the Boost Software License 1.0. For more information see COPYING.