The 192.68.* and 10.* downloads work when there still is a path between you and the uploader via the Gnutella connections. When you try to download a file from these firewalled hosts you send your request back from where the query hit came from. These are also called push requests.

Force IP details by afisk:
<http://www.gnutellaforums.com/showth...er=2#post23824>