ZyXEL NBG6515 User Guide - Page 81
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Chapter 11 Wireless LAN • Use the Advanced screen (Section 11.7 on page 90) to allow wireless advanced features, such as intra-BSS networking and set the RTS/CTS Threshold. • Use the QoS screen (Section 11.8 on page 91) to set priority levels to services, such as e-mail, VoIP, chat, and so on. • Use the WPS screen (Section 11.9 on page 91) to quickly set up a wireless network with strong security, without having to configure security settings manually. • Use the WPS Device screen (Section 11.10 on page 92) to add a wireless device using WPS. • Use the Scheduling screen (Section 11.11 on page 93) to set the times your wireless LAN is turned on and off. • Use the Guest WLAN screen (Section 11.12 on page 94) to configure multiple BSSs on the NBG. 11.3 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. • 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. 11.3.1 Wireless Security Overview The following sections introduce different types of wireless security you can set up in the wireless network. 11.3.1.1 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. 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. 11.3.1.2 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 characters2; for example, 00A0C5000002 or 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. 2. Hexadecimal characters are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F. NBG6515 User's Guide 81