ZyXEL Prestige 660HW-D1 Wireless Router 91-004-593003B Manual Do Utilizador

P-660H/HW-D Series User’s Guide

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Chapter 7 Wireless LAN

Usually, you should set up the strongest encryption that every wireless client in the wireless 
network supports. For example, suppose the AP does not have a local user database, and you 
do not have a RADIUS server. Therefore, there is no user authentication. Suppose the wireless 
network has two wireless clients. Device A only supports WEP, and device B supports WEP 
and WPA. Therefore, you should set up Static WEP in the wireless network.

Note: It is recommended that wireless networks use WPA-PSK, WPA, or stronger 

encryption. IEEE 802.1x and WEP encryption are better than none at all, but it 
is still possible for unauthorized devices to figure out the original information 
pretty quickly.

It is not possible to use WPA-PSK, WPA or stronger encryption with a local 
user database. In this case, it is better to set up stronger encryption with no 
authentication than to set up weaker encryption with the local user database.

When you select WPA2 or WPA2-PSK in your ZyXEL Device, you can also select an option 
(WPA compatible) to support WPA as well. In this case, if some wireless clients support 
WPA and some support WPA2, you should set up WPA2-PSK or WPA2 (depending on the 
type of wireless network login) and select the WPA compatible option in the ZyXEL Device.

Many types of encryption use a key to protect the information in the wireless network. The 
longer the key, the stronger the encryption. Every wireless client in the wireless network must 
have the same key.

With ZyXEL’s OTIST, you set up the SSID and WPA-PSK on the ZyXEL Device. Then, the 
ZyXEL Device transfers them to the devices in the wireless networks. As a result, you do not 
have to set up the SSID and encryption on every device in the wireless network.

The devices in the wireless network have to support OTIST, and they have to be in range of 
the ZyXEL Device when you activate it. See 

 for more details.

The following sections introduce different ways to improve the performance of the wireless 
network.

You can turn on Wi-Fi MultiMedia (WMM) QoS to improve the performance of voice and 
video applications in the wireless network. QoS gives high priority to voice and video, which 
makes them run more smoothly. Similarly, it gives low priority to many large file downloads 
so that they do not reduce the quality of other applications.