ZyXEL Communications G-102 Guia do Utilizador descarregar pdf (Página 51)

ZyXEL G-1000 v2 User’s Guide

Chapter 4 Wireless LAN 51

• 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.

4.2.4 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

4.2.3 on page 50 for information about this.)

For example, if the wireless network has a RADIUS server, you can choose IEEE 802.1x,

IEEE 802.1x + Static WEP, IEEE 802.1x + Dynamic WEP, WPA or WPA2. If users do not

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 G-1000 v2. The G-1000

v2 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.

Table 14 Types of Encryption for Each Type of Authentication

No Authentication RADIUS Server

Weakest None IEEE 802.1x

Static WEP IEEE 802.1x + Static WEP

WPA-PSK WPA

Strongest WPA2-PSK WPA2

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 197 198

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ZyXEL Communications G-102 Guia do Utilizador Página 51