ZyXEL Communications ZyAIR G-2000 Plus, User Manual, Page: 101 / 430

ZyAIR G-2000 Plus User’s Guide
Chapter 7 Wireless Security 100
7.9 Introduction to RADIUS
RADIUS is based on a client-sever model that supports authentication and accounting, where
access point is the client and the server is the RADIUS server. The RADIUS server handles
the following tasks among others:
• Authentication
Determines the identity of the users.
• Accounting
Keeps track of the client’s network activity.
RADIUS user is a simple package exchange in which your ZyAIR acts as a message relay
between the wireless station and the network RADIUS server.
7.9.1 Types of RADIUS Messages
The following types of RADIUS messages are exchanged between the access point and the
RADIUS server for user authentication:
• Access-Request
Sent by an access point requesting authentication.
• Access-Reject
Sent by a RADIUS server rejecting access.
• Access-Accept
Sent by a RADIUS server allowing access.
7.9.1.1 Access-Challenge
Sent by a RADIUS server requesting more information in order to allow access. The access
point sends a proper response from the user and then sends another Access-Request message.
WPA Group Key
Update Timer
The WPA Group Key Update Timer is the rate at which the AP (if using WPA-
PSK key management) or RADIUS server (if using WPA key management)
sends a new group key out to all clients. The re-keying process is the WPA
equivalent of automatically changing the WEP key for an AP and all stations in a
WLAN on a periodic basis. Setting of the WPA Group Key Update Timer is also
supported in WPA-PSK mode. The ZyAIR default is 1800 seconds (30 minutes).
Apply Click Apply to save your changes back to the ZyAIR.
Reset Click Reset to reload the previous configuration for this screen.
Table 26 Wireless: WPA
LABEL DESCRIPTION