Dare I but in here but IF you are going to forward any ports you MUST have a static IP. There's generally instructions on how to do this somewhere such as Support for your modem or PortForward.com. You'd also need to forward a separate port for each computer linked (eg: Comp. A: port 6346, Comp. B: port 6342, etc.) If your modem/router is able to use UPnP technology then port forwarding may not be necessary. Set the device up to use UPnP & likewise within LW: Tools>Options>Advanced>Firewalls set for using UPnP. But only UPnP capable devices can use this.