Phex might be the easiest choice for you here, since it implements the current Gnutella Standard (0.6) already supports private networks.

- Phex Private Networks: http://www.gnutellaforums.com/adapti...vate-networks/

Also you migth be interested in the developer section of our wiki:
- Developers Wanted - PhexWiki
- How to get the code: Subversion - PhexWiki

Phex Developers Toolkit:
- Phex Developers Toolkit

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