I believe the D-Link DI-604 will have UPnP abilities & thus should be enabled. I have heard a couple of complaints UPnP doesn't always work well on D-Link, so always consider manual port forwarding also;
http://www.portforward.com/english/r...2/Limewire.htm
For Di-Link UPnP info then see the UPnP section here:
Connection problems? Check here first! (click on link)
Do you see a brick wall in front of the blue world icon at the bottom of LW's interface?