ZyXEL Communications Corporation PLA4231 Manuel D’Utilisation
Chapter 10 Wireless LAN
PLA4231 User’s Guide
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• Use the Advanced screen (
) to configure wireless advanced features,
such as set the RTS/CTS Threshold and HT physical mode.
• Use the QoS screen (
) to enable Wifi MultiMedia Quality of Service
(WMMQoS). This allows the PLA4231 to automatically set priority levels to services, such as e-
mail, VoIP, chat, and so on.
mail, VoIP, chat, and so on.
• Use the WPS screen (
) to quickly set up a wireless network with strong
security, without having to configure security settings manually.
• Use the WPS Station screen (
) to add a wireless station using WPS.
• Use the Scheduling screen (
) to set the times your wireless LAN is
turned on and off.
10.3 What You Should Know
Every wireless network must follow these basic guidelines.
• Every wireless client in the same wireless network must use the same SSID.
The SSID is the name of the wireless network. It stands for Service Set IDentity.
• If two wireless networks overlap, they should use different channels.
Like radio stations or television channels, each wireless network uses a specific channel, or
frequency, to send and receive information.
frequency, to send and receive information.
• Every wireless client in the same wireless network must use security compatible with the AP.
Security stops unauthorized devices from using the wireless network. It can also protect the
information that is sent in the wireless network.
information that is sent in the wireless network.
10.3.1 Wireless Security Overview
The following sections introduce different types of wireless security you can set up in the wireless
network.
network.
10.3.1.1 SSID
Normally, the AP acts like a beacon and regularly broadcasts the SSID in the area. You can hide the
SSID instead, in which case the AP does not broadcast the SSID. In addition, you should change
the default SSID to something that is difficult to guess.
SSID instead, in which case the AP does not broadcast the SSID. In addition, you should change
the default SSID to something that is difficult to guess.
This type of security is fairly weak, however, because there are ways for unauthorized devices to
get the SSID. In addition, unauthorized devices can still see the information that is sent in the
wireless network.
get the SSID. In addition, unauthorized devices can still see the information that is sent in the
wireless network.
10.3.1.2 MAC Address Filter
Every wireless client has a unique identification number, called a MAC address.
1
A MAC address is
usually written using twelve hexadecimal characters
2
; for example, 00A0C5000002 or
00:A0:C5:00:00:02. To get the MAC address for each wireless client, see the appropriate User’s
Guide or other documentation.
Guide or other documentation.
1.
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.
of wireless devices might not have MAC addresses.
2.
Hexadecimal characters are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F.