ZyXEL Communications NWA-3166 User Manual page 267

The Windows XP patch is a free download that adds WPA capability to Windows
XP's built-in "Zero Configuration" wireless client. However, you must run Windows
XP to use it.
WPA(2) with RADIUS Application Example
You need the IP address of the RADIUS server, its port number (default is 1812),
and the RADIUS shared secret. A WPA(2) application example with an external
RADIUS server looks as follows. "A" is the RADIUS server. "DS" is the distribution
system.
The AP passes the wireless client's authentication request to the RADIUS server.
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The RADIUS server then checks the user's identification against its database and
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grants or denies network access accordingly.
The RADIUS server distributes a Pairwise Master Key (PMK) key to the AP that
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then sets up a key hierarchy and management system, using the pair-wise key to
dynamically generate unique data encryption keys to encrypt every data packet
that is wirelessly communicated between the AP and the wireless clients.
Figure 168 WPA(2) with RADIUS Application Example
WPA(2)-PSK Application Example
A WPA(2)-PSK application looks as follows.
NWA-3166 User's Guide
Appendix B Wireless LANs
267