Buffalo Technology AIRSTATION WHR-G125 - Manual (Page 18)

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By default, encryption is not enabled on the
AirStation unless you used AOSS to perform your
setup. Anyone within range can easily connect to
your wireless network. This might not be what you
want.
Buffalo recommends enabling encryption and
setting a password for access to your network. This
is easy to configure from within the AirStation’s
configuration tool. Select the Wireless Config tab
and the Security submenu. Use the strongest form of
encryption that all of your clients support.
Encryption and Security