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71
P
ART
II
Network
Wireless LAN
(73)
Wireless Tutorial
(93)
WAN
(101)
LAN
(111)
Guest WLAN
(117)
DHCP
(123)
Network Address Translation (NAT)
(129)
Dynamic DNS
(139)
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72
Page 73 / 296
NBG334W User’s Guide
73
C
HAPTER
5
Wireless LAN
This chapter discusses how to configure the wireless network settings in your NBG334W. See
the appendices for more detailed information about wireless networks.
5.1
Wireless Network Overview
The following figure provides an example of a wireless network.
Figure 33
Example of a Wireless Network
The wireless network is the part in the blue circle. In this wireless network, devices A and B
are called wireless clients. The wireless clients use the access point (AP) to interact with other
devices (such as the printer) or with the Internet. Your NBG334W is the AP.
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.
Page 74 / 296
Chapter 5 Wireless LAN
NBG334W User’s Guide
74
•
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.
Requirements
To add a wireless LAN to your existing network, make sure you have the following:
1
an access point (AP) or a router with the wireless feature
2
at least one wireless network card/adapter which varies according to your computer.
•If you have a desktop, use either a wireless USB adapter or a wireless PCI adapter.
•If you have a laptop, use either a wireless USB adapter or a wireless CardBus card.
3
a RADIUS server only if you want to use IEEE802.1x, WPA or WPA2
To have two or more computers communicate with each other wirelessly without an AP or
wireless router, make sure you have the following:
1
two or more wireless network cards/adapters which vary according to your computers.
•If you have a desktop, use either a wireless USB adapter or a wireless PCI adapter.
•If you have a laptop, use either a wireless USB adapter or a wireless CardBus card.
Setup Information
To set up your wireless network using an AP or wireless router, make sure your AP or wireless
router and wireless network card(s)/adapter(s) use the same following settings:
• SSID:_____________________
• Channel: auto or _________
• Network type of a wireless network card/adapter: Infrastructure
• wireless standard: IEEE 802.11b, g, b/g or a
• Security:
(
) None
(
) WEP (64bit, 128bit or 256bit key) (ASCII or Hex):________________
(
) IEEE 802.1x
(
) WPA-PSK (TKIP or AES):_______________
(
) WPA (TKIP or AES)
(
) WPA2-PSK (TKIP or AES):______________
(
) WPA2 (TKIP or AES)
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Chapter 5 Wireless LAN
NBG334W User’s Guide
75
• Preamble type (if available): auto, short or long
To set up your wireless network without an AP or wireless router, make sure wireless network
cards/adapters use the same following settings:
• Network type: Ad-Hoc
• SSID:_____________________
• Channel: _________________
• wireless standard: IEEE 802.11b, g, b/g or a
• Security:
(
) None
(
) WEP (64bit, 128bit or 256bit key) (ASCII or Hex):________________
5.2
Wireless Security Overview
The following sections introduce different types of wireless security you can set up in the
wireless network.
5.2.1
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.
5.2.2
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.
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.
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.

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