Select Use WPA Encryption.

In the WPA Radius IP box, type the IP address of your RADIUS server.

In the WPA Radius Port box, type the WPA Radius Port.

In the WPA Radius Key box, type the WPA Radius Key.

In the WPA Version list, click the desired WPA version.

WPA2:
WPA2 is the most secure version, but not all wireless clients already support it. Before you select this version, make sure all of your wireless clients support it.

WPA+WPA2:
If not all of your wireless clients support WPA2 or you are not sure if they support WPA2, we recommend you to choose WPA+WPA2. Wireless clients that support WPA2 will use WPA2, the others will use WPA.

WPA:
If none of your wireless clients support WPA2 choose this option.

To use WPA2 on Windows XP SP2 you first have to install Wi-Fi Protected Access 2 (WPA2)/Wireless Provisioning Services Information Element (WPS IE) update. You can find this update on http://support.microsoft.com/kb/917021.

Click Apply to immediately apply your changes.

Configure your wireless client(s) with the same settings.