ZyXEL Communications Network Router wireless active fiber router Uživatelský manuál stáhnout pdf (Strana 148)

Appendix D Wireless LANs

FSG1100HN User’s Guide

148

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.

• 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 network from unauthorized access.

Types of Authentication

This appendix discusses some popular authentication types: EAP-MD5, EAP-

TLS, EAP-TTLS, PEAP and LEAP.

The type of authentication you use depends on the RADIUS server or the AP.

Consult your network administrator for more information.

EAP-MD5 (Message-Digest Algorithm 5)

MD5 authentication is the simplest one-way authentication method. The

authentication server sends a challenge to the wireless station. The wireless

station ‘proves’ that it knows the password by encrypting the password with

the challenge and sends back the information. Password is not sent in plain

text.

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ZyXEL Communications Network Router wireless active fiber router Uživatelský manuál Strana 148