You'll need to forward a port for your router: Port Forwarding instructions for the Draytek Vigor 260 & use Port 6346 Make sure you set up a static ip 1st, instruction link in the previous link.

You'll also need to force ip within LW: Force IP instructions & sample image

Make sure your Java is reasonably up to date: Java 1.4.2 (click on link)

Configure your firewalls here: http://www.limewire.com/english/content/firewalls.shtml