Extend your Wi-Fi signal with Linksys WRT54G (main router) and ASUS RT-N10 (repeater)
As a first step .I have upgraded firmware to latest version. Next switched router to repeater mode, selected Wi-Fi network provided by WRT54G, provided network WPA2 password. Everything seemed OK, except for authorisation.
I have realised I had enabled Wireless MAC Access filter on WRT54G, so I added RT-N10 MAC address to the filter list. Unfortunately this did not help. The solution was to temporarily disable Wireless MAC address filter (on WRT54G) and find out MAC address RT-N10 uses for Wi-Fi connection (in DD-WRT Web interface), which was different from MAC address shown in RT-N10 Web interface (last hex number was increased by 1, e.g. 9C -> 9D).
After correcting MAC address in the filter list (and enabled MAC filtering again), repeater mode started to work.