ZyXEL P-660HW-D1 Guia Do Utilizador

Prestige 660H/HW Series User’s Guide

397 

 Splitters and Microfilters

In June 2001, the IEEE 802.1x standard was designed to extend the features of IEEE 802.11 to 
support extended authentication as well as providing additional accounting and control 
features. It is supported by Windows XP and a number of network devices. Some advantages 
of IEEE 802.1x are:

• User based identification that allows for roaming.
• Support for RADIUS (Remote Authentication Dial In User Service, RFC 2138, 2139) for 

centralized user profile and accounting management on a network RADIUS server. 

• Support for EAP (Extensible Authentication Protocol, RFC 2486) that allows additional 

authentication methods to be deployed with no changes to the access point or the wireless 
stations. 

RADIUS is based on a client-server model that supports authentication, authorization and 
accounting. The access point is the client and the server is the RADIUS server. The RADIUS 
server handles the following tasks:

• Authentication 

Determines the identity of the users.

• Authorization

Determines the network services available to authenticated users once they are connected 
to the network.

• Accounting

Keeps track of the client’s network activity. 

RADIUS is a simple package exchange in which your AP acts as a message relay between the 
wireless station and the network RADIUS server. 

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.