If you're using dd-wrt sp1, do not attempt this tutorial. You will not be able to configure a wireless client bridge in this version, so be sure to check your device's dd-wrt firmware version and update accordingly before starting this tutorial.

Assuming that your primary router is already flashed with dd-wrt v24 sp2 and setup with a home network with a LAN IP address of 192.168.1.1. If your primary router has a different LAN IP address, just adjust the IP accordingly to match that of yours and everything should work fine. There is no need to configure your primary router in this tutorial (although, in some cases - the wireless security needs to be changed to WPA2 Personal on both the primary and secondary router for it to work.)

Once you're done flashing your secondary router to sp2, turn your wifi connection off. Turning off your wifi connection while processing the config of your secondary router will prevent any errors or sudden disconnection that will result in a bricked router or even something worse.

Connect to the web GUI via a web browser (http://192.168.1.1) and enter your desired username and password. Navigate first to Wireless > Wireless Security. Change your wireless security to match that of your primary's router.

wireless client bridge

Here is a script that is useful if you have a wireless client bridge in your network. A wireless client is good to have within your network because it adds scalability and efficiency to your network. Nevertheless, in order for it to be reliable in the network; it has to be connected to your main router at all times. If you are experiencing a disconnection between your main router and your wireless client bridge often; you may want to add this script to your main router.

If you are running dd-wrt v24 presp2, you can add this script to your start up to ensure connection between your main router and your wireless client bridge.

In the main router's web GUI, navigate to Administration > Commands and copy and paste the following script in open text box. After you have edited the script to your wireless bridge's ip address click Save Startup