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D-Link DWL-8500AP Product Manual - Page 43

Enabling Station Isolation, Configuring Virtual Access Point Security, Multicast, Broadcast, Unicast

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4 Configuring Access Point Security Additionally, this mode incorporates a RADIUS server for user authentication which makes WPA Enterprise more secure than WPA Personal mode. Use the following guidelines for choosing options within the WPA Enterprise mode security mode: 1. Currently, the best security you can have on a wireless network is WPA Enterprise mode using AES-CCMP encryption algorithm. AES is a symmetric 128-bit block data encryption technique that works on multiple layers of the network. It is the most effective encryption system currently available for wireless networks. If all clients or other APs on the network are WPA/CCMP compatible, use this encryption algorithm. (If all clients are WPA2 compatible, choose to support only WPA2 clients.) 2. The second best choice is WPA Enterprise with the encryption algorithm set to both TKIP and CCMP. This lets WPA client stations without CCMP associate, uses TKIP for encrypting Multicast and Broadcast frames, and allows clients to select whether to use CCMP or TKIP for Unicast (AP-to-single-station) frames. This WPA configuration allows more interoperability, at the expense of some security. Client stations that support CCMP can use it for their Unicast frames. If you encounter AP-to-station interoperability problems with the "Both" encryption algorithm setting, then you will need to select TKIP instead. (See next bullet.) 3. The third best choice is WPA Enterprise with the encryption algorithm set to TKIP. Some clients have interoperability issues with CCMP and TKIP enabled at same time. If you encounter this problem, then choose TKIP as the encryption algorithm. This is the standard WPA mode and is usually interoperable with client Wireless software security features. Enabling Station Isolation When Station Isolation is enabled, the access point blocks communication between wireless clients associated with the same radio on the access point. The access point still allows data traffic between its wireless clients and wired devices on the network, but not among wireless clients. You enable station isolation on the Wireless settings page. For more information, see "Setting the Wireless Interface" on page 55. Configuring Virtual Access Point Security You configure secure wireless client access by configuring security for each virtual access point (VAP) that you enable. You can configure up to eight VAPs per radio that simulate multiple APs in one physical access point. By default, only one VAP is enabled. For each VAP, you can configure a unique security mode to control wireless client access. VAPs segment the wireless LAN into multiple broadcast domains and are the wireless equivalent of Ethernet VLANs. You can configure each VAP with a unique SSIDs so that each VAP represents a different wireless network for clients to access. By configuring VAPs, you can maintain better control over broadcast and multicast traffic, which affects network performance. Configuring Virtual Access Point Security 43

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 Virtual Access Point Security

Configuring Access Point Security

Additionally, this mode incorporates a RADIUS server for user authentication which makes

WPA Enterprise more secure than WPA Personal mode.

Use the following guidelines for choosing options within the WPA Enterprise mode security

mode:

Currently, the best security you can have on a wireless network is WPA Enterprise mode

using AES-CCMP encryption algorithm. AES is a symmetric 128-bit block data

encryption technique that works on multiple layers of the network. It is the most effective

encryption system currently available for wireless networks. If all clients or other APs on

the network are WPA/CCMP compatible, use this encryption algorithm. (If all clients are

WPA2 compatible, choose to support only WPA2 clients.)

The second best choice is WPA Enterprise with the encryption algorithm set to both TKIP

and CCMP. This lets WPA client stations without CCMP associate, uses TKIP for

encrypting

Multicast

and

Broadcast

frames, and allows clients to select whether to use

CCMP or TKIP for

Unicast

(AP-to-single-station) frames. This WPA configuration allows

more interoperability, at the expense of some security. Client stations that support CCMP

can use it for their

Unicast

frames. If you encounter AP-to-station interoperability

problems with the “Both” encryption algorithm setting, then you will need to select TKIP

instead. (See next bullet.)

The third best choice is WPA Enterprise with the encryption algorithm set to

TKIP

. Some

clients have interoperability issues with CCMP and TKIP enabled at same time. If you

encounter this problem, then choose TKIP as the encryption algorithm. This is the

standard WPA mode and is usually interoperable with client Wireless software security

features.

Enabling Station Isolatio

When Station Isolation is enabled, the access point blocks communication between wireless

clients associated with the same radio on the access point. The access point still allows data

traffic between its wireless clients and wired devices on the network, but not among wireless

clients. You enable station isolation on the Wireless settings page. For more information, see

“Setting the Wireless Interface”

on page 55.

Configuring Virtual Access Point Security

You configure secure wireless client access by configuring security for each virtual access

point (VAP) that you enable. You can configure up to eight VAPs per radio that simulate

multiple APs in one physical access point. By default, only one VAP is enabled. For each VAP,

you can configure a unique security mode to control wireless client access.

VAPs segment the wireless LAN into multiple broadcast domains and are the wireless

equivalent of Ethernet VLANs. You can configure each VAP with a unique SSIDs so that each

VAP represents a different wireless network for clients to access. By configuring VAPs, you

can maintain better control over broadcast and multicast traffic, which affects network

performance.