vastator: people have no problem downloading from you, because your Limewire is properly config'ed. However, if someone's Limewire is misconfigured and behind a firewall, they will advertise files to be downloaded that no one can fetch.

I've seen this quite often, and it's a real issue that clogs up the works. Limewire (and other gnutalla clients) should be programmed not to advertise files for non-routable address, such as:

192.168.*.*
172.16.*.* through 172.31.*.*
24.*.*.*
127.*.*.*
etc...