How to use DDWRT Linksys router to create acces point or repeater?

Here is my problem:

I have suddenlink as an Internet Service Provider (ISP) and i currently use their router for my home. My home is rather large and i would like to connect my Linksys (WRT54GS) router to my main router to allow me to connect with a stronger signal and custom login details in my electronics room.
One constraint is i can't run an ethernet cable between the two routers so it would have to connect wirelessly.

My Solution (what i have tried): I have a dell inspiron 1545 win 7, and i have tethered my iphone 4 between the computer. While i had it tethered i used internet connection sharing (ICS) to repet the signal through my ethernet port and out to my xbox and to my shock it worked. I tried to do the same with ICS to my router but it was a fail.

I need serious help. I'm not a networker.

One nifty feature of DD-WRT that most stock firmwares don't have, is the ability to operate as a "Repeater Bridge". You'd have your primary router (the gateway supplied by Suddenlink) set up normally, and set up your WRT to run as the repeater bridge.

Wireless clients could then connect to either router - in most cases they'd automatically connect to whichever one had the stronger signal.

There's a well-written HowTo on the DD-WRT website that discusses how to set this up for both Broadcom-based devices (like your WRT54GS) and Atheros devices (like my Netgear WNDR3700).So, rather than just repeating it here (get it? "repeating" it… Sorry, it was a poor pun), I'll just give you the link to the HowTo.

http://www.dd-wrt.com/wiki/index.php/Repeater_Bridge

If you give this a try and encounter any problems, raise a new question on Y! Answers and I'm sure you'll get help.

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