Chapter 5 Wireless LAN

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.

5.2.4 Encryption

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 Section 5.2.3 on page 80 for information about this.)

Table 28 Types of Encryption for Each Type of Authentication

 

 

 

 

NO AUTHENTICATION

RADIUS SERVER

Weakest

None

 

 

 

 

 

 

 

 

 

 

 

Static WEP

 

 

 

 

 

 

 

 

 

 

 

WPA-PSK

WPA

 

 

 

 

Strongest

 

 

WPA2-PSK

WPA2

 

 

 

 

 

 

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.

"It is recommended that wireless networks use WPA-PSK, WPA, or stronger encryption.

When you select WPA2 or WPA2-PSKin your ZyXEL Device, you can also select an option (WPA compatible) to support WPA as well. In this case, if some of the devices support WPA and some support WPA2, you should set up WPA2-PSKor 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 device in the wireless network must have the same key.

 

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P-2302HWUDL-P1 Series User’s Guide