ZyXEL Communications VMG5313-B30A Guide de l'utilisateur télécharger pdf (Page 344)

Appendix D Wireless LANs

VMG1312-B Series User’s Guide

344

EAP-TTLS (Tunneled Transport Layer Service)

EAP-TTLS is an extension of the EAP-TLS authentication that uses certificates for only the server-

side authentications to establish a secure connection. Client authentication is then done by sending

username and password through the secure connection, thus client identity is protected. For client

authentication, EAP-TTLS supports EAP methods and legacy authentication methods such as PAP,

CHAP, MS-CHAP and MS-CHAP v2.

PEAP (Protected EAP)

Like EAP-TTLS, server-side certificate authentication is used to establish a secure connection, then

use simple username and password methods through the secured connection to authenticate the

clients, thus hiding client identity. However, PEAP only supports EAP methods, such as EAP-MD5,

EAP-MSCHAPv2 and EAP-GTC (EAP-Generic Token Card), for client authentication. EAP-GTC is

implemented only by Cisco.

LEAP

LEAP (Lightweight Extensible Authentication Protocol) is a Cisco implementation of IEEE 802.1x.

Dynamic WEP Key Exchange

The AP maps a unique key that is generated with the RADIUS server. This key expires when the

wireless connection times out, disconnects or reauthentication times out. A new WEP key is

generated each time reauthentication is performed.

If this feature is enabled, it is not necessary to configure a default encryption key in the wireless

security configuration screen. You may still configure and store keys, but they will not be used while

dynamic WEP is enabled.

Note: EAP-MD5 cannot be used with Dynamic WEP Key Exchange

For added security, certificate-based authentications (EAP-TLS, EAP-TTLS and PEAP) use dynamic

keys for data encryption. They are often deployed in corporate environments, but for public

deployment, a simple user name and password pair is more practical. The following table is a

comparison of the features of authentication types.

Table 124 Comparison of EAP Authentication Types

EAP-MD5 EAP-TLS EAP-TTLS PEAP LEAP

Mutual Authentication No Yes Yes Yes Yes

Certificate – Client No Yes Optional Optional No

Certificate – Server No Yes Yes Yes No

Dynamic Key Exchange No Yes Yes Yes Yes

Credential Integrity None Strong Strong Strong Moderate

Deployment Difficulty Easy Hard Moderate Moderate Moderate

Client Identity Protection No No Yes Yes No

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ZyXEL Communications VMG5313-B30A Guide de l'utilisateur Page 344