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EDCF Control of Data Frames and Arbitration Interframe Spaces

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6 Configuring Access Point Services A different type of data is associated with each queue. The queue and associated priorities and parameters for transmission are as follows: • Data 0 (Voice). Highest priority queue, minimum delay. Time-sensitive data such as Voice over IP (VoIP) is automatically sent to this queue. • Data 1 (Video). High priority queue, minimum delay. Time-sensitive data such as Video and other streaming media are automatically sent to this queue. • Data 2 (Best Effort). Medium priority queue, medium throughput and delay. Most traditional IP data is sent to this queue. • Data 3 (Background). Lowest priority queue, high throughput. Bulk data that requires maximum throughput and is not time-sensitive is sent to this queue (FTP data, for example). Using the QoS settings on the Administration UI, you can configure Enhanced Distributed Channel Access (EDCA) parameters that determine how each queue is treated when it is sent by the access point to the client or by the client to the access point. Wireless traffic travels: • Downstream from the access point to the client station • Upstream from client station to access point • Upstream from access point to network • Downstream from network to access point With WMM enabled, QoS settings on the Unified Access Point affect the first two of these; downstream traffic flowing from the access point to client station (AP EDCA parameters) and the upstream traffic flowing from the station to the access point (station EDCA parameters). With WMM disabled, you can still set some parameters on the downstream traffic flowing from the access point to the client station (AP EDCA parameters). The other phases of the traffic flow (to and from the network) are not under control of the QoS settings on the AP. EDCF Control of Data Frames and Arbitration Interframe Spaces Data is transmitted over 802.11 wireless networks in frames. A Frame consists of a discrete portion of data along with some descriptive meta-information packaged for transmission on a wireless network. Each frame includes a source and destination MAC address, a control field with protocol version, frame type, frame sequence number, frame body (with the actual information to be transmitted) and frame check sequence for error detection. The 802.11 standard defines various frame types for management and control of the wireless infrastructure, and for data transmission. 802.11 frame types are (1) management frames, (2) control frames, and (3) data frames. Management and control frames (which manage and control the availability of the wireless infrastructure) automatically have higher priority for transmission. 802.11e uses interframe spaces to regulate which frames get access to available channels and to coordinate wait times for transmission of different types of data. Configuring Quality of Service (QoS) 71

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

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Configuring Quality of Service (QoS)

Configuring Access Point Services

A different type of data is associated with each queue. The queue and associated priorities and

parameters for transmission are as follows:

•

Data 0 (Voice). Highest priority queue, minimum delay. Time-sensitive data such as Voice

over IP (VoIP) is automatically sent to this queue.

•

Data 1 (Video). High priority queue, minimum delay. Time-sensitive data such as Video

and other streaming media are automatically sent to this queue.

•

Data 2 (Best Effort). Medium priority queue, medium throughput and delay. Most

traditional IP data is sent to this queue.

•

Data 3 (Background). Lowest priority queue, high throughput. Bulk data that requires

maximum throughput and is not time-sensitive is sent to this queue (FTP data, for

example).

Using the QoS settings on the Administration UI, you can configure

Enhanced Distributed

Channel Access

(EDCA) parameters that determine how each queue is treated when it is sent

by the access point to the client or by the client to the access point.

Wireless traffic travels:

•

Downstream from the access point to the client station

•

Upstream from client station to access point

•

Upstream from access point to network

•

Downstream from network to access point

With WMM enabled, QoS settings on the Unified Access Point affect the first two of these;

downstream

traffic flowing from the access point to client station (AP EDCA parameters) and

the

upstream

traffic flowing from the station to the access point (station EDCA parameters).

With WMM disabled, you can still set some parameters on the downstream traffic flowing

from the access point to the client station (AP EDCA parameters).

The other phases of the traffic flow (to and from the network) are not under control of the QoS

settings on the AP.

EDCF Control of Data Frames and Arbitration Interframe Spaces

Data is transmitted over 802.11 wireless networks in

frames

. A

Frame

consists of a discrete

portion of data along with some descriptive meta-information packaged for transmission on a

wireless network.

Each frame includes a source and destination MAC address, a control field with protocol

version, frame type, frame sequence number, frame body (with the actual information to be

transmitted) and frame check sequence for error detection.

The 802.11 standard defines various

frame

types for management and control of the wireless

infrastructure, and for data transmission. 802.11 frame types are (1)

management frames

, (2)

control frames

, and (3)

data frames

. Management and control frames (which manage and

control the availability of the wireless infrastructure) automatically have higher priority for

transmission.

802.11e uses

interframe spaces

to regulate which frames get access to available channels and

to coordinate wait times for transmission of different types of data.