Examples of other p2p: BearShare, Phex, Frostwire, torrent apps...other file sharing applications.

Try port forwarding for your router (it has a firewall), the instructions are here.
Port Forwarding for the Dlink EBR-2310
Don't forget the step of setting up a static IP address first, or port forwarding won't work. Make sure that LW's listening port, port in the 'manual port forward' box & port forwarded within the router are the same number.