Manual ZyXEL VMG8623-T50A (page 389 of 421) (English)

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Appendix B Wireless LANs

VMG/XMG Series User’s Guide

389

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.

WPA and WPA2

WiFi Protected Access (WPA) is a subset of the IEEE 802.11i standard. WPA2 (IEEE 802.11i) is a wireless

security standard that defines stronger encryption, authentication and key management than WPA.

Key differences between WPA or WPA2 and WEP are improved data encryption and user

authentication.

If both an AP and the wireless clients support WPA2 and you have an external RADIUS server, use WPA2

for stronger data encryption. If you don't have an external RADIUS server, you should use WPA2-PSK

(WPA2-Pre-Shared Key) that only requires a single (identical) password entered into each access point,

Table 168 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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