I came across this question and it seems similar, however I dont have an XBOX and its not D-Link specific as both of my network devices are D-Link. So, I figured I'd ask.
I just purchased a D-Link DIR-825 wireless router and I am hoping that I can "extend" my LAN by connecting it to my existing D-Link DGL-4100 wired router.
I dont know if I worded that correctly but basically, I'd like to be able to connect an Ethernet cable from one of the ports on the 4100 (wired) to one of the ports on the 825 (wireless and wired) and gain 3 extra wired ports as well as serve wireless in my house.
Currently, the 4100 is set up as 192.168.1.1 and is the DHCP server for the network. There will be two iPhones, a laptop and an iMac connecting to the wireless and three other desktops plus a printer on the wired.
If the answers for my situation are the same then I shall delete this question and refer there.