Currently have a DGL-4100 as my primary router via DSL modem. There is a switch attached to the 4100 for my office LAN. Want to add a DGL-4500 wireless router (which I presently own) to use as a WiFi A/P. I tried to configure by changing the IP address (of the 4500), adding a reserved IP in the 4100, and turning off the DHCP & UPnP (per the manual) in the 4500. Had the 4100 & 4500 connected via the LAN ports. Not sure what to do about the internet connection settings of the 4500. Of course it didn't work. I'm not a network guru & this has got me baffled!! Are there any detailed directions I can download? I tried D-Link phone tech, and only wound up hot-swapping a bunch of my patch cables!!