Instructions HERE NOTE: You MUST 1st set up a Static IP for port forwarding to work! Follow the instructions on setting up a static ip very carefully. There's 2 parts. Follow the 1st link for setting up static ip & then at the bottom of that page will be another link for finishing it. Then do the port forwarding. Not knowing which client you're using, most likely you will need to open
Port 6346 since that's what most gnutella clients use on the gnutella network.