ZyXEL Communications LTE5366 Series, Руководство пользователя

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Chapter 7 Wireless LAN
LTE5366 Series User’s Guide
68
You can use the MAC address filter to tell the AP which wireless clients are allowed or not allowed to use
the wireless network. If a wireless client is allowed to use the wireless network, it still has to have the
correct settings (SSID, channel, and security). If a wireless client is not allowed to use the wireless
network, it does not matter if it has the correct settings.
This type of security does not protect the information that is sent in the wireless network. Furthermore,
there are ways for unauthorized devices to get the MAC address of an authorized wireless client. Then,
they can use that MAC address to use the wireless network.
User Authentication
You can make every user log in to the wireless network before they can use it. This is called user
authentication. However, every wireless client in the wireless network has to support IEEE 802.1x to do
this.
For wireless networks, there are two typical places to store the user names and passwords for each user.
• In the AP: this feature is called a local user database or a local database.
• In a RADIUS server: this is a server used in businesses more than in homes.
If your AP does not provide a local user database and if you do not have a RADIUS server, you cannot
set up user names and passwords for your users.
Unauthorized 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.
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 user authentication. (See page 68 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 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
Table 20 Types of Encryption for Each Type of Authentication
NO AUTHENTICATION RADIUS SERVER
Weakest No Security WPA
Static WEP
WPA-PSK
Strongest WPA2-PSK WPA2