Buffalo Technology AIRSTATION WHR-G125 - Manual (Page 17)

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This AirStation supports quickly changing the
product from a wireless router to a conventional
access point.
For normal use, leave the “Router” switch in the ON
position.
If the Router switch is moved to OFF, the default IP
address of the AirStation changes from 192.168.11.1
to 192.168.11.100, and DHCP, NAT, and the WAN
port are disabled.
Turning this switch off might be desirable if you’re
adding wireless capability to an existing network
with a router. It is not suitable for most home configurations. If you plan to use the
AirStation as an normal wireless router, make sure that this switch is in the normal (ON)
position!
Router Mode