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Beacon Interval, DTIM Period, Fragmentation, Threshold, Radio Settings, Table 16., Field, Description

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D-Link Unified Access Point Administrator's Guide Table 16. Radio Settings Field Beacon Interval DTIM Period Fragmentation Threshold Description Enter a value from 20 to 2000 milliseconds. Beacon frames are transmitted by an access point at regular intervals to announce the existence of the wireless network. The default behavior is to send a beacon frame once every 100 milliseconds (or 10 per second). Specify a DTIM period from 1-255 beacons. The Delivery Traffic Information Map (DTIM) message is an element included in some Beacon frames. It indicates which client stations, currently sleeping in low-power mode, have data buffered on the access point awaiting pick-up. The DTIM period you specify indicates how often the clients served by this access point should check for buffered data still on the AP awaiting pickup. The measurement is in beacons. For example, if you set this field to 1, clients will check for buffered data on the AP at every beacon. If you set this field to 10, clients will check on every 10th beacon. Specify a number between 256 and 2,346 to set the frame size threshold in bytes. The fragmentation threshold is a way of limiting the size of frames transmitted over the network. If a packet exceeds the fragmentation threshold, the fragmentation function is activated and the packet is sent as multiple 802.11 frames. If the packet being transmitted is equal to or less than the threshold, fragmentation is not used. Setting the threshold to the largest value (2,346 bytes) effectively disables fragmentation. Fragmentation involves more overhead both because of the extra work of dividing up and reassembling of frames it requires, and because it increases message traffic on the network. However, fragmentation can help improve network performance and reliability if properly configured. Sending smaller frames (by using lower fragmentation threshold) might help with some interference problems; for example, it might help with microwave oven interference. By default, fragmentation is off. We recommend not using fragmentation unless you suspect radio interference. The additional headers applied to each fragment increase the overhead on the network and can greatly reduce throughput. 60 © 2001-2008 D-Link Corporation. All Rights Reserved.

Section	Page
Unified Access Point (AP) Administrator’s Guide	1
Table of Contents	3
List of Figures	7
List of Tables	9
About This Document	11
Document Organization	11
Audience	11
Document Conventions	11
Online Help, Supported Browsers, and Limitations	12
Overview of the D-Link Access Point	15
Features and Benefits	16
IEEE Standards Support	16
Wireless Features	16
Security Features	17
Networking	17
Maintainability	17
Access Point Hardware	18
Preparing to Install the Access Point	19
Default Settings for the Unified Access Points	19
Administrator’s Computer Requirements	21
Wireless Client Requirements	22
Dynamic and Static IP Addressing on the AP	23
Recovering an IP Address	23
Discovering a Dynamically Assigned IP Address	23
Using the Reset Button	23
Installing the Access Point	25
Installing the Unified Access Point	25
Viewing Basic Settings	29
Using the CLI to View the IP Address	30
Configuring the Ethernet Interface	31
Using the Web UI to configure Ethernet Settings	31
Using the CLI to Configure Ethernet Settings	33
Configuring IEEE 802.1X Authentication	34
Using the Web UI to Configure 802.1X Authentication Information	35
Using the CLI to Configure 802.1X Authentication Information	36
Verifying the Installation	36
Configuring Access Point Security	39
Understanding Security on Wireless Networks	39
Choosing a Security Mode	39
Comparing Security Modes	40
When to Use Unencrypted (No Security)	40
When to Use Static WEP	40
When to Use IEEE 802.1X	41
When to Use WPA Personal	42
When to Use WPA Enterprise	42
Enabling Station Isolation	43
Configuring Virtual Access Point Security	43
None (Plain-text)	45
Static WEP	45
Static WEP Rules	48
Example of Using Static WEP	48
IEEE 802.1X	49
WPA Personal	50
WPA Enterprise	52
Prohibiting the SSID Broadcast	53
Managing the Access Point	55
Setting the Wireless Interface	55
Using the 802.11h Wireless Mode	57
Configuring Radio Settings	58
Configuring Virtual Access Points	62
Controlling Access by MAC Authentication	66
Configuring a MAC Filter List on the AP	66
Configuring MAC Authentication on the RADIUS Server	67
Configuring Load Balancing	68
Configuring Access Point Services	69
Configuring Quality of Service (QoS)	69
Understanding QoS	69
QoS and Load Balancing	69
802.11e and WMM Standards Support	70
QoS Queues and Parameters to Coordinate Traffic Flow	70
QoS Queues and Diff-Serve Code Points (DSCP) on Packets	70
EDCF Control of Data Frames and Arbitration Interframe Spaces	71
Random Backoff and Minimum / Maximum Contention Windows	72
Packet Bursting for Better Performance	73
Transmission Opportunity (TXOP) Interval for Client Stations	73
802.1p and DSCP tags	73
Configuring QoS Settings	75
Enabling the Network Time Protocol Server	79
Enabling or Disabling a Network Time Protocol (NTP) Server	80
Maintaining the Access Point	81
Managing the Configuration File	81
Resetting the Factory Default Configuration	82
Saving the Current Configuration to a Backup File	83
Restoring the Configuration from a Previously Saved File	83
Rebooting the Access Point	85
Upgrading the Firmware	85
Configuring the Access Point for Managed Mode	87
Transitioning Between Modes	87
Configuring Managed Access Point Settings	88
Viewing Managed AP DHCP Information	89
Viewing Access Point Status	91
Viewing Interface Status	91
Ethernet (Wired) Settings	92
Wireless Settings	92
Viewing Events Logs	92
Configuring Persistent Logging Options	93
Configuring the Log Relay Host for Kernel Messages	94
Example of Using Linux syslogd	94
Enabling or Disabling the Log Relay Host on the Events Page	95
Viewing Transmit and Receive Statistics	95
Viewing Client Association Information	97
Link Integrity Monitoring	98
Viewing Neighboring Access Points	98
Wireless Client Settings and RADIUS Server Setup	101
Accessing Wireless Client Security Settings	102
Configuring a Client to Access an Unsecure Network	104
Configuring Static WEP Security on a Client	104
Configuring WPA/WPA2 Personal on a Client	106
Using an External Authentication Server	108
Configuring IEEE 802.1X Security on a Client	108
IEEE 802.1X Client Using EAP/TLS Certificate	108
Configuring WPA/WPA2 Enterprise (RADIUS)	111
WPA/WPA2 Enterprise (RADIUS) Client Using EAP/PEAP	111
WPA/WPA2 Enterprise (RADIUS) Client Using EAP-TLS Certificate	113
Configuring the RADIUS Server for Authentication	116
Obtaining a TLS-EAP Certificate for a Client	119
Configuring the RADIUS Server for VLAN Tags	122
CLI for AP Configuration	125
How to Access the Access Point CLI	125
Telnet Connection to the AP	125
SSH Connection to the AP	126
Commands and Syntax	127
Using the get Command	128
Using the set Command	128
Using the add Command	129
Using the remove Command	129
Additional CLI Commands	130
Getting Help on Commands at the CLI	130
Tab Completion	130
Keyboard Shortcuts	131
Interface Naming Conventions	132
Saving Configuration Changes	133
Access Point CLI Commands	134
Configuring Basic Settings	134
Status	135
Ethernet Settings	136
Wireless Interface	137
Radio Settings	138
Virtual Access Points	139
Set Security to Static WEP	140
Set Security to IEEE 802.1X	142
Set Security to WPA/WPA2 Personal (PSK)	143
Set Security to WPA/WPA2 Enterprise (RADIUS)	144
Managed Access Point	146
IEEE 802.1X Supplicant Authentication	147
Quality of Service	147
Time	149
System Management	150
CLI Classes and Properties Reference	150

Match case Limit results 1 per page

D-Link Unified Access Point Administrator’s Guide

Beacon Interval

Enter a value from 20 to 2000 milliseconds.

Beacon

frames are transmitted by an access point at regular

intervals to announce the existence of the wireless network. The

default behavior is to send a beacon frame once every 100

milliseconds (or 10 per second).

DTIM Period

Specify a DTIM period from 1-255 beacons.

The Delivery Traffic Information Map (DTIM) message is an

element included in some

Beacon

frames. It indicates which client

stations, currently sleeping in low-power mode, have data buffered

on the access point awaiting pick-up.

The DTIM period you specify indicates how often the clients

served by this access point should check for buffered data still on

the AP awaiting pickup.

The measurement is in beacons. For example, if you set this field

to 1, clients will check for buffered data on the AP at every beacon.

If you set this field to 10, clients will check on every 10th beacon.

Fragmentation

Threshold

Specify a number between 256 and 2,346 to set the frame size

threshold in bytes.

The fragmentation threshold is a way of limiting the size of frames

transmitted over the network. If a packet exceeds the fragmentation

threshold, the fragmentation function is activated and the packet is

sent as multiple 802.11 frames.

If the packet being transmitted is equal to or less than the threshold,

fragmentation is not used.

Setting the threshold to the largest value (2,346 bytes) effectively

disables fragmentation.

Fragmentation involves more overhead both because of the extra

work of dividing up and reassembling of frames it requires, and

because it increases message traffic on the network. However,

fragmentation can help

improve

network performance and

reliability if properly configured.

Sending smaller frames (by using lower fragmentation threshold)

might help with some interference problems; for example, it might

help with microwave oven interference.

By default, fragmentation is off. We recommend not using

fragmentation unless you suspect radio interference. The additional

headers applied to each fragment increase the overhead on the

network and can greatly reduce throughput.

Table 16.

Radio Settings

Field

Description