ZyXEL P-663HN-51 Manuel d'utilisateur télécharger pdf (Page 162)

Chapter 18 Wireless LAN

P-663HN-51 User’s Guide

162

This type of security is fairly weak, however, because there are ways for

unauthorized wireless devices to get the SSID. In addition, unauthorized wireless

devices can still see the information that is sent in the wireless network.

18.10.3.2 MAC Address Filter

Every device that can use a wireless network has a unique identification number,

called a MAC address.

A MAC address is usually written using twelve hexadecimal

characters

; for example, 00A0C5000002 or 00:A0:C5:00:00:02. To get the MAC

address for each device in the wireless network, see the device’s User’s Guide or

other documentation.

You can use the MAC address filter to tell the ZyXEL Device which devices are

allowed or not allowed to use the wireless network. If a device is allowed to use

the wireless network, it still has to have the correct information (SSID, channel,

and security). If a device is not allowed to use the wireless network, it does not

matter if it has the correct information.

This type of security does not protect the information that is sent in the wireless

network. Furthermore, there are ways for unauthorized wireless devices to get the

MAC address of an authorized device. Then, they can use that MAC address to use

the wireless network.

18.10.3.3 User Authentication

Authentication is the process of verifying whether a wireless device is allowed to

use the wireless network. You can make every user log in to the wireless network

before they can use it. However, every device in the wireless network has to

support IEEE 802.1x to do this.

For wireless networks, you can store the user names and passwords for each user

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.

2. Some wireless devices, such as scanners, can detect wireless networks but cannot use wireless networks.

These kinds of wireless devices might not have MAC addresses.

3. Hexadecimal characters are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F.

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 299 300

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