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•

The

Wired Ethernet

section of the table displays traffic statistics for the wired Ethernet

interface.

•

The

Wireless

section displays traffic statistics for the wireless interface.

2.

Click

Refresh

to update the current statistics.

Configuring the Advanced Wireless Settings

We recommend that the Advanced Wireless Settings should be modified only by an administrator

very familiar with the ramifications of changing the Wireless LAN parameters. If set incorrectly,

they can adversely affect the performance or connectivity of your wireless access point. The

default settings should be adequate in most situations. Following is a description of each of the

Wireless LAN Parameters.

•

WMM Support.

Wi-Fi Multimedia (WMM) is a Quality of Service (QoS) feature that

provides prioritization of wireless data packets from different applications based on four

access categories: voice, video, best effort, and background. For an application to receive the

benefits of WMM QoS, both the application and the client running that application must be

WMM-enabled. Legacy applications that do not support WMM, and applications that do not

require QoS, are assigned to the best-effort category, which receives a lower priority than

voice and video.

The default setting is Enabled.

•

RTS Threshold.

The Request to Send Threshold packet size determines if the wireless access

point should use the CSMA/CD (Carrier Sense Multiple Access with Collision Detection)

mechanism or the CSMA/CA mechanism for packet transmission:

–

With the CSMA/CD transmission mechanism, the transmitting station sends out the actual

packet as soon as it has waited for the silence period.

Figure 4-7

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–

With the CSMA/CA transmission mechanism, the transmitting station sends out an RTS

packet to the receiving station, and waits for the receiving station to send back a CTS

(Clear to Send) packet before sending the actual packet data.

The default value is 2346.

•

Fragmentation Length.

This is the maximum packet size used for fragmentation. Packets

larger than the size programmed in this field will be fragmented. The Fragment Threshold

value must be larger than the RTS Threshold value.

The default value is 2346

•

Beacon Interval.

The Beacon Interval specifies the interval of time between 20ms and

1000ms for each beacon transmission.

The default value is 100 ms.

•

DTIM Interval.

The Delivery Traffic Indication Message Interval specifies the data beacon

rate between 1 and 255.

The default value is 1.

•

Preamble Type

.

A long transmit preamble may provide a more reliable connection or slightly

longer range. A short transmit preamble gives better performance. The Auto setting will

automatically handle both long and short preamble.

The default setting is Auto.

The Wireless Optimization Settings feature allows you to adapt the wireless performance

depending on the type of wireless clients that will be used in your network. The available

settings are:

•

11Next Max Speed.

This setting yields the best Wireless N performance when only 802.11n

clients are present. This is the default setting.

•

11b/g/Next Mixed Mode.

This setting yields the best overall performance when a mixture of

802.11b, 802.11g, and 802.11n clients are present.

To modify the Advanced Wireless Settings:

1.

Select

Wireless Settings

under the

Advanced

menu on the left navigation pane of the user

interface. The

Advanced Wireless Settings

screen will display.

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2.

Make the changes to the Wireless LAN Settings based on the field descriptions

outlined above.

3.

Click

Apply

for your changes to take effect.

Configuring the RADIUS Server Settings

RADIUS (Remote Authentication Dial In User Service) is a protocol for managing

Authentication, Authorization and Accounting (AAA) of multiple users in a network. A RADIUS

server stores a database of user information, and can validate a user at the request of a gateway

device in the network when a user requests access to network resources. The wireless access point

can relay login information from wireless clients to an external RADIUS server for AAA services.

In an environment with many users, using a RADIUS server allows centralized control for

individual users, providing better network security than using a single preshared key for all users.

Figure 4-8

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Configure the RADIUS Server Settings menu with the parameters described in

Table 4-1

:

To configure the RADIUS Server Settings:

1.

Select

Radius Server Settings

under the

Security

menu on the left navigation pane of the

user interface. The

Radius Server Settings

screen will display.

Table 4-1.

RADIUS Server Settings Fields

Field

Description

Primary and Secondary

Authentication Servers

The Authentication RADIUS Server provides authentication and access control.

The primary server is mandatory. A secondary server, which will be used if the

primary server fails, is optional.

IP Address

The IP address of the authentication server. If no server is present, enter

0.0.0.0.

Port Number

The port number used for communication to the authentication server. The

default port number for an authentication server is 1812.

Shared Secret

The shared secret to establish a client connection to the Radius server, as

entered on the server itself.

Re-authentication Time

The time interval in seconds after which the supplicant will be authenticated

again with the RADIUS Server.

The default interval is 3600 seconds.

Update Global Key

Enable this option to have the Global Key changed according to the time

interval specified. If enabled, enter the desired time interval.

The default is enable, and the default interval is 3600 Seconds

Update if any station

disassociates

Enable this option to refresh the Global Key whenever any station disassociates

with the wireless access point. The default is disable.

Primary and Secondary

Accounting Servers

The Accounting RADIUS Server provides accounting services. The same

RADIUS server may be used for both authentication and accounting, but the

port numbers for authentication and accounting must be different. The

accounting servers are optional.

IP Address

The IP address of the accounting server. If no server is present, enter 0.0.0.0.

Port Number

The port number used for communication to the accounting server. The default

port number for an accounting server is 1813.

Shared Secret

The shared secret to establish a client connection to the RADIUS server, as

entered on the server itself.

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2.

Make the changes to the RADIUS Server Settings based on the field descriptions outlined

above.

3.

Click

Apply

for your changes to take effect.

Figure 4-9