Bedienungsanleitung ZyXEL NWD2105 (Seite 35 von 176) (Englisch)

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Chapter 3 Wireless LANs

NWD2105 User’s Guide

• Shared mode involves a shared secret key to authenticate the wireless station to the AP or peer

computer. This requires you to enable the wireless LAN security and use same settings on both

the wireless station and the AP or peer computer.

• Auto authentication mode allows the NWD2105 to switch between the open system and shared

key modes automatically. Use the auto mode if you do not know the authentication mode of the

other wireless stations.

3.3.1.2 IEEE 802.1x

The IEEE 802.1x standard outlines enhanced security methods for both the authentication of

wireless stations and encryption key management. Authentication can be done using an external

RADIUS server.

3.3.1.2.1 EAP Authentication

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

802.1x transport mechanism in order to support multiple types of user authentication. By using EAP

to interact with an EAP-compatible RADIUS server, an access point helps a wireless station and a

RADIUS server perform authentication.

The type of authentication you use depends on the RADIUS server and an intermediary AP(s) that

supports IEEE 802.1x. The NWD2105 supports EAP-TLS, EAP-TTLS (at the time of writing, TTLS is

not available in Windows Vista) and EAP-PEAP. Refer to Appendix B on page 119 for descriptions.

For EAP-TLS authentication type, you must first have a wired connection to the network and obtain

the certificate(s) from a certificate authority (CA). Certificates (also called digital IDs) can be used

to authenticate users and a CA issues certificates and guarantees the identity of each certificate

owner.

3.3.1.3 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(2) and WEP are improved data encryption and user authentication.

Both WPA and WPA2 improve data encryption by using Temporal Key Integrity Protocol (TKIP),

Message Integrity Check (MIC) and IEEE 802.1x. WPA and WPA2 use Advanced Encryption

Standard (AES) in the Counter mode with Cipher block chaining Message authentication code

Protocol (CCMP) to offer stronger encryption than TKIP.

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.

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