Yesterday I bought a Airport Express so I could stream my music through my big money home stereo system. According to the manual I could use the AirPort express to expand my pre-existing wireless network. I started working on this at 9Pm and finally figured it out by 4AM First I have the Belkin F5D7231-4 so this will work with this router & I've heard the F5D7230-4. Basically your Belkin needs to support "Wireless Bridge" or "WDS". Configuring the Belkin: Set your DHCP Server Range to what ever you desire. I use 192.168.2.2 - 192.168.2.22. Save your Changes. Go to Wireless Bridge: Enable Wireless Bridging & Enable Only Specific Access Points to connect.. Input the mac address of your Air Port Express into the field and save your changes. Next configure your wireless security. You have to choose WPA "2". I repeat you have to choose WPA2. Setup your password and save your changes. For the Encryption Technique I use TKIP. I have not tried AES and can not verify it works. Save your changes and say man this is pretty easy so far. Configuring the AirPort Express to act as an expander: At this point its a good idea to take a pin and reset the AirPort Express. After it boots back up change your wireless networks and log on to it. Loadup the Airport Admin Utility. Now choose to configure your AirPort Express. Change all the settings you see for Name / Contact / Location to your liking. Under Airport Network: Choose Join an Exisiting Wireless Network (Wireless Client) Find your Belkin under Wireless Network: It should be called what ever you named it. It will ask for your WPA2 Personal password to join the network so enter it twice. Now click on the internet tab at the top: Connect using: Wireless Network Configure TCP/IP Choose to Configure Manually. Ip address you need to make it something outside of your Belkins DCHP Server Range. I used: 192.168.2.50 because my range stops at 22. Subnet: 255.255.255.0 Router Addy: 192.168.2.1 DNS Server: 192.168.2.1 Now choose the Music Tab at the top and configure it to your liking. Give All your options a once over and then hit update. Wait for the AirPort Express to load up and enjoy the Green Light Thanks for reading.