The wrt54g acts like a "wireless ethernet bridge", which in fact is another product sold by linksys (WET54G) for around $150. This is also useful when you have devices (in a room which doesn't have ethernet connections) which can only connect using a ethernet cable, but cannot connect wirelessly - like XBOX !

Adam wrote his original guide in 2006, with a fully-DD-WRT-compatible Linksys WRT54GL router, and at that point, those who picked up a blue Linksys box without knowing about open-source firmware Turn an old router into a wireless bridge or repeater and By installing the free DD-WRT firmware on the old router, you can turn it into a wireless bridge or repeater. This means that even devices that can't reach your main router can get connected Linksys Wireless Router User Manuals Download - ManualsLib

WRT54G Wireless-G BroadBand Router Firmware Free Linksys, A Division of Cisco Systems Windows Vista/7/8/10 Version 4.21.5 Full Specs Visit Site External Download Site

Wireless Bridge - DD-WRT Wiki Router: Linksys WAG 325N, org. firmware, bridge WRT54Gl (dd-wrt v24): WPA2 didn't work initially. So I set up the bridge in WEP. Tried WPA and WPA 2 later (just changed it back on router & bridge, no reconnecting or anything: Worked flawlessly. -onkl WRT54G Client Bridge - YouTube Jun 04, 2014

Linksys Wireless-G Broadband Router - WRT54GL - Wireless

Setup a Wireless Ethernet Bridge On Your Tomato Router As with other wireless bridge modes in Tomato, you’ll want to gather some information about the host router (such as the SSID, WiFi channel, etc). Get The Subnet and IP Address Of the Host Router. With ‘Ethernet Bridge’ mode, you should have administrative access to the primary host router. Repeater Bridge - DD-WRT Wiki