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Server and Client applications for testing network connectivity.
...Both applications display logs when the client connects and the data is being sent and received.
This is a useful tool when configuring network routers or firewalls. The source code is a demonstration of sockets and multithreading programming using C#.
A simple port-relaying program written in Java; sits on specified ports for either TCP or UDP, re-sends packets to the given IP. Doesn't forward packets, actually receives and re-sends them. Could be handy to learn Java Sockets/networking. Public Domain.