ZyXEL Communications P-661HW Series ユーザーズマニュアル

P-661H/HW Series User’s Guide

Chapter 6 Wireless LAN

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For wireless networks, user names and passwords can be stored in a RADIUS server. This is a 
server used in businesses more than in homes. If you do not have a RADIUS server, you 
cannot set up user names and passwords for your users.

Unauthorized wireless devices can still see the information that is sent in the wireless network, 
even if they cannot use the wireless network. Furthermore, there are ways for unauthorized 
wireless users to get a valid user name and password. Then, they can use that user name and 
password to use the wireless network.

Local user databases also have an additional limitation that is explained in the next section.

Wireless networks can use encryption to protect the information that is sent in the wireless 
network. Encryption is like a secret code. If you do not know the secret code, you cannot 
understand the message.

The types of encryption you can choose depend on the type of authentication. (See 

 for information about this.)

For example, if the wireless network has a RADIUS server, you can choose WPA or WPA2. 
If users do not log in to the wireless network, you can choose no encryption, Static WEP, 
WPA-PSK, or WPA2-PSK.

Usually, you should set up the strongest encryption that every device in the wireless network 
supports. For example, suppose you have a wireless network with the ZyXEL Device. The 
ZyXEL Device does not have a local user database, and you do not have a RADIUS server. 
Therefore, there is no authentication. Suppose the wireless network has two devices. 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 wireless 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.

Table 35   Types of Encryption for Each Type of Authentication

No Security

WPA

Static WEP

WPA-PSK

WPA2-PSK

WPA2