ZyXEL ZyAIR G-570S User Manual download pdf (Page 77)

ZyXEL G-570S User’s Guide

Chapter 6 Wireless Screens 77

• 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.

• 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.

The following types of RADIUS messages are exchanged between the access point and the

RADIUS server for user accounting:

• Accounting-Request

Sent by the access point requesting accounting.

• Accounting-Response

Sent by the RADIUS server to indicate that it has started or stopped accounting.

In order to ensure network security, the access point and the RADIUS server use a shared

secret key, which is a password, they both know. The key is not sent over the network. In

addition to the shared key, password information exchanged is also encrypted to protect the

wired network from unauthorized access.

6.8 EAP Authentication Overview

EAP (Extensible Authentication Protocol) is an authentication protocol that runs on top of the

IEEE802.1x transport mechanism in order to support multiple types of user authentication. By

using EAP to interact with an EAP-compatible RADIUS server, the access point helps a

wireless station and a RADIUS server perform authentication.

The type of authentication you use depends on the RADIUS server or the AP. The G-570S

supports EAP-TLS, EAP-TTLS, EAP-MD5 and PEAP with RADIUS. Refer to the appendix

about the types of EAP authentication for descriptions on the common types.

Your G-570S supports EAP-MD5 (Message-Digest Algorithm 5) and PEAP (Protected EAP)

with the built-in RADIUS server.

The following figure shows an overview of authentication when you specify a RADIUS server

on your access point.

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ZyXEL ZyAIR G-570S User Manual Page 77