Software used in stun results test

I have had a few questions about the software used for the tests.

It is all open source (not GPL can be used in commercial products) and is at
http://sourceforge.net/projects/stun/

A server is running at larry.gloo.net. There is a windows executable
(WinStun) that you can use to test what type of NAT you have with pretty
minimal effort. 

There is a command line client and server that runs in linux, Macosx, and
windows. It will probably work on most unix boxes. There are no
instructions, it was hard to write, it should be hard to use. The server
requires you to configure two IP addresses on the machine.