This link might be of some help
http://buffalo-sg.custhelp.com/app/answers/detail/a_id/14255/kw/repeater/related/1
I have set up the system as instructed, including setting security mode same as that of the AP, and my buffalo router is sucessfully connected to the AP, but my computer fails to receive internet signal from the router, unless disabling the AP's security/encryption, i.e leaving it open without WEP or WPA on.
Two different procedure are described on the link I sent you,
Which one did you use?
Wireless Bridge Link
WDS setup
Dear Realborat
I use the first one, wireless bridge link. After setup, under Status-Wireless-Wireless Nodes I also see the presence of the AP. But my computer still cannot access the internet. By the way, my computer is connected to G300N router through the LAN cable.