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Page 81 / 249 Scroll up to view Page 76 - 80
Chapter 11 Wireless LAN
NBG6515 User’s Guide
81
•
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 characters
2
; 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.
Page 82 / 249
Chapter 11 Wireless LAN
NBG6515 User’s Guide
82
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.
11.3.1.3
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 user authentication.
Usually, you should set up the strongest encryption that every wireless client in the wireless
network supports. Suppose the wireless network has two wireless clients. Device A only supports
WEP, and device B supports WEP and WPA-PSK. Therefore, you should set up
WEP
in the wireless
network.
Note: It is recommended that wireless networks use
WPA-PSK
or stronger encryption.
IEEE 802.1x and WEP encryption are better than none at all, but it is still possible
for unauthorized devices to figure out the original information pretty quickly.
When you select
WPA2-PSK
in your NBG, you can also select an option (
WPA Compatible
) to
support WPA as well. In this case, if some wireless clients support WPA and some support WPA2,
you should set up
WPA2-PSK
(depending on the type of wireless network login) and select the
WPA Compatible
option in the NBG.
Many types of encryption use a key to protect the information in the wireless network. The longer
the key, the stronger the encryption. Every wireless client in the wireless network must have the
same key.
11.3.1.4
WPS
WiFi Protected Setup (WPS) is an industry standard specification, defined by the WiFi Alliance. WPS
allows you to quickly set up a wireless network with strong security, without having to configure
security settings manually. Depending on the devices in your network, you can either press a
button (on the device itself, or in its configuration utility) or enter a PIN (Personal Identification
Number) in the devices. Then, they connect and set up a secure network by themselves. See how
to set up a secure wireless network using WPS in the
Section 10.3 on page 72
.
Table 37
Types of Encryption for Each Type of Authentication
NO AUTHENTICATION
Weakest
No Security
WEP
WPA-PSK
Strongest
WPA2-PSK
Page 83 / 249
Chapter 11 Wireless LAN
NBG6515 User’s Guide
83
11.3.1.5
WDS
Wireless Distribution System or WDS security is used between bridged APs. It is independent of the
security between the wired networks and their respective APs. If you do not enable WDS security,
traffic between APs is not encrypted. When WDS security is enabled, both APs must use the same
pre-shared key.
11.4
General Wireless LAN 2.4G/5G General Screen
Use this screen to enable the Wireless LAN 2.4G or 5G, enter the SSID and enable Guest WLAN.
Note: If you are configuring the NBG from a computer connected to the wireless LAN and
you change the NBG’s SSID, channel or security settings, you will lose your
wireless connection when you press
Apply
to confirm. You must then change the
wireless settings of your computer to match the NBG’s new settings.
This screen varies depending on whether you chose
Static WEP, WPA, WPA2, WPA-PSK or
WPA2-PSK
to add security on the selected wireless network. The wireless clients which want to
associate to this network must have same wireless security settings as the NBG.
No Security
allows any client to connect to this network without authentication.
If you enable the WPS function, only
No Security, Static WEP, WPA-PSK and WPA2-PSK
are
available in this field.
Click
Network
>
Wireless LAN 2.4G
or
Wireless LAN 5G
to open the
General
screen.
Figure 65
Network > Wireless LAN 2.4G/5G > General
Page 84 / 249
Chapter 11 Wireless LAN
NBG6515 User’s Guide
84
The following table describes the general wireless LAN labels in this screen.
Table 38
Network > Wireless LAN 2.4G/5G > General
LABEL
DESCRIPTION
Wireless Setup
Wireless LAN
Select the radio button to
Enable
or
Disable
Wireless LAN
.
You can turn the wireless LAN on or off using the switch at the rear panel of the NBG.
Network Name
(SSID)
(Service Set IDentity) The SSID identifies the Service Set with which a wireless station is
associated. Wireless stations associating to the NBG must have the same SSID. Enter a
descriptive name (up to 32 keyboard characters) for the wireless LAN.
Hide SSID
Select this check box to hide the SSID in the outgoing beacon frame so a station cannot
obtain the SSID through scanning using a site survey tool.
Channel
Selection
Set the operating frequency/channel depending on your particular region.
Select a channel from the drop-down list box. The options vary depending on the frequency
band and the country you are in.
Refer to the Connection Wizard chapter for more information on channels. This option is
only available if
Auto Channel Selection
is disabled.
Operating
Channel
This displays the channel the NBG is currently using.
Network Mode
(Wireless LAN
2.4G)
Select
11b/g mixed mode
to allow IEEE802.11b and IEEE802.11g compliant WLAN
devices to associate with the NBG.
Select
11b only
to allow only IEEE 802.11b compliant WLAN devices to associate with the
NBG.
Select
11g only
to allow only IEEE 802.11g compliant WLAN devices to associate with the
NBG.
Select
11n only
to allow only IEEE 802.11n compliant WLAN devices to associate with the
NBG.
Select
11b/g/n mixed mode
to allow IEEE802.11b, IEEE802.11g and IEEE802.11n
compliant WLAN devices to associate with the NBG.
Network Mode
(Wireless LAN
5G)
Select
11a/n mixed mode
to allow IEEE802.11a and IEEE802.11n compliant WLAN
devices to associate with the NBG.
Select
11a only
to allow only IEEE 802.11a compliant WLAN devices to associate with the
NBG.
Select
11ac/a/n
to allow only IEEE 802.11a, IEEE802.11an and IEEE802.11ac compliant
WLAN devices to associate with the NBG.
Channel
Bandwidth
Select the channel bandwidth you want to use for your wireless network.
It is recommended that you select
20/40
(20, 40, 20/40 MHz).
Select 20 MHz if you want to lessen radio interference with other wireless devices in your
neighborhood.
Extension
Channel
This is set to
Auto
by default.
If you select
20/40
as your
Channel Bandwidth
, the extension channel enables the NBG
to get higher data throughput. This also lowers radio interference and traffic.
Security
Page 85 / 249
Chapter 11 Wireless LAN
NBG6515 User’s Guide
85
See the rest of this chapter for information on the other labels in this screen.
11.5
General Wireless LAN 2.4G/5G Security Screen
This screen varies depending on whether you chose
Static WEP, WPA-PSK or WPA2-PSK
to add
security on the selected wireless network. The wireless clients which want to associate to this
network must have same wireless security settings as the NBG.
No Security
allows any client to
connect to this network without authentication.
11.5.1
No Security
Select
No Security
to allow wireless stations to communicate with the access points without any
data encryption.
Note: If you do not enable any wireless security on your NBG, your network is accessible
to any wireless networking device that is within range.
Figure 66
Network > Wireless LAN 2.4G/5G > General: No Security
Security Mode
Select
Static WEP
,
WPA-PSK
,
WPA2-PSK
to add security on this wireless network. The
wireless clients which want to associate to this network must have same wireless security
settings as this device. After you select to use a security, additional options appears in this
screen.
Section 11.5 on page 85
for detailed information on different security modes. Or you
can select
No Security
to allow any client to associate this network without authentication.
Note: If the WPS function is enabled (default), only
No Security
and
WPA2-PSK
are
available in this field.
Apply
Click
Apply
to save your changes back to the NBG.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 38
Network > Wireless LAN 2.4G/5G > General (continued)
LABEL
DESCRIPTION

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