Manual ZyXEL NBG4615 v2 (page 287 of 308) (English)

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Appendix D Wireless LANs

NBG4615 v2 User’s Guide

287

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

Wi-Fi 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, wireless gateway and wireless client. As long as the passwords match, a wireless

client will be granted access to a WLAN.

If the AP or the wireless clients do not support WPA2, just use WPA or WPA-PSK depending on

whether you have an external RADIUS server or not.

Select WEP only when the AP and/or wireless clients do not support WPA or WPA2. WEP is less

secure than WPA or WPA2.

Table 107 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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