As I said if there not rated on Bitzi there probably fake files...
What is the make and model number for your modem/router ??
Most modem/routers have Nat Firewalls within...
Also try installing these....
Install PeerGuardian, it will help keep the fake hosts out...Remember to enable PG just before you start limewire up...
Phoenix Labs » PeerGuardian 2
Another thing if you are using limewire 4.13 and later you can apply this hostile list...This will block known fake IP addresses...
The TechNutopia Fullsize Hostiles List for BearShare and LimeWire