You
should pick a non-overlapping channel frequency for better
performance [Fig. 5]. Channels 1, 6 and 11 do not overlap
with each other in the United States. For example, if your
repeater is broadcasting on channel 7 you can select either
channel 1 or 11 on the second router. Everything will work
even without proper channel assignments. This is just a precaution
to avoid interference.
Also
type in the SSID. This is the name you will see when connecting
to the router wirelessly. It should be different from the
SSID of the repeater.

Fig. 5 Pick a SSID and change the
channel number
The
last and the most important step is to go to the "Setup"
tab [Fig 6]. Under "Basic Setup" we'll change the
"Local IP Address" to place the second router in
the repeater's subnet. In this case the repeater IP is 10.0.0.1
so I changed the IP address on the second router to 10.0.0.120.
The last place number (120) can be any number smaller than
255 and other than 0 or 1.
Select
"Disable" under "DHCP Server" on the same
page.

Fig. 6 Click on the image to see
the entire page
At this point you are ready to connect to the internet as
long as the repeater is working properly. The LAN ports on
the WHR-G125 and the wireless connection are both available
for use at this time. You can still access control panels
for each router by entering their respective IP addresses
into a browser. In this case 10.0.0.1 takes you to the repeater's
GUI and 10.0.0.120 takes you to the Buffalo router.
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