Note, the DOS downloads can be run in Windows and OS/2 as well ...
Version 2.0f of JNOS contains a mistake that messes up headers during forwarding ...
* download this file, put it in the JNOS 2.0f source directory before you compile.
To compile your own JNOS executable, here is the latest source ...
JNOS 2.0f - complete source - instructions