User Guide Wireless LAN Access Point 8760 3CRWE876075 / WL-546 www.3com.com/ Part Number 10015153 Rev.
3Com Corporation 350 Campus Drive Marlborough, MA 01752-3064 Copyright © 2006 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.
Contents 1 Introduction Product Features 2 Security 2 Performance and Reliability 3 Virtual Access Point (VAP) Support 3 WDS Bridging and Spanning Tree Protocol (STP) Support Manageability 4 Wireless Network Standards 4 802.11g 4 802.
3 Initial Configuration Networks with a DHCP Server 1 Networks without a DHCP Server 1 Using the 3Com Installation CD 2 Launch the 3COM Wireless Infrastructure Device Manager (Widman) utility 2 Launching the 3com Wireless Interface Device Manager 2 First Time Only 4 Using the Setup Wizard 4 4 System Configuration Advanced Setup 14 System Identification 16 TCP / IP Settings 17 RADIUS 20 Authentication 22 Filter Control 27 VLAN 29 SNMP 31 Configuring SNMP and Trap Message Parameters Configuring SNMPv3 User
Wi-Fi Protected Access (WPA) 5 69 Command Line Interface Using the Command Line Interface 77 Accessing the CLI 77 Console Connection 77 Telnet Connection 78 Entering Commands 79 Keywords and Arguments 79 Minimum Abbreviation 79 Command Completion 79 Getting Help on Commands 79 Showing Commands 80 Partial Keyword Lookup 80 Negating the Effect of Commands Using Command History 81 Understanding Command Modes Exec Commands 81 Configuration Commands 82 Command Line Processing 82 Command Groups 83 6 Troubles
TERMINOLOGY Access Point—An internetworking device that seamlessly connects wired and wireless networks. Ad Hoc—An ad hoc wireless LAN is a group of computers, each with wireless adapters, connected as an independent wireless LAN. Backbone—The core infrastructure of a network. The portion of the network that transports information from one central location to another central location where it is unloaded onto a local system.
VAP—Virtual Access Point. An access point radio capable of operating as four separate access points. VLAN—Virtual Local Area Network. A LAN consisting of groups of hosts that are on physically different segments but that communicate as though they were on the same segment. WEP—Wired Equivalent Privacy is based on the use of security keys and the popular RC4 encryption algorithm. Wireless devices without a valid WEP key will be excluded from network traffic. WDS—Wireless Distribution System.
1 INTRODUCTION The 3Com® Wireless 8760 Dual-radio 11a/b/g PoE Access Point offers a dual-mode architecture that supports 802.11g, 802.11a, and 802.11b wireless users on a single device. This means you can mix and match radio bands to meet different coverage and bandwidth needs within the same area. With their flexibility and unfettered access, wireless LANs are changing the way people work.
CHAPTER 1: INTRODUCTION PRODUCT FEATURES Access Point 8760—Creates an enterprise-class wireless LAN supporting up to 256 simultaneous users. The access point supports two radios and external antennas including WDS bridging ability on both radios. SECURITY 3Com offers one of the most robust suite of standards-based security on the market today. To protect sensitive data broadcast over the wireless LAN, 3Com supports WPA and WPA2 security standards.
Product Features PERFORMANCE AND RELIABILITY 3Com wireless access point performance features ensure reliable and seamless connections for users wherever they roam: Automatic channel selection automatically finds the least loaded channel for interference-free communication. Auto network connect and dynamic rate shifting keep users connected through a wide variety of conditions by changing to the optimum connection speed as they move through the network.
CHAPTER 1: INTRODUCTION MANAGEABILITY 3Com offers a wide range of standards-based management support, from SNMP to 3Com Network Supervisor and HP OpenView for seamless integration with your wired network. Wireless Infrastructure Device Manager lets you configure parameters, run diagnostics, backup and restore configurations, and monitor performance from anywhere on the network using an embedded web server browser.
Wireless Network Standards 802.11A 802.11a operates at the 5 GHz band and supports data rates at up to 54 Mbps. For those organizations demanding even higher speeds, a “turbo mode” feature can boost throughput rates up to 108 Mbps. And because there are fewer devices in the 5 GHz band, there’s less potential for RF interference. However, because it is at an entirely different radio spectrum, it is not compatible with 802.11g.
Complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 3Com Wireless 8760 Dual Radio 11a/b/g PoE Access Point Model WL-546 Industry Canada – RF Compliance This device complies with RSS 210 of Industry Canada.
2 INSTALLING THE ACCESS POINT This equipment must be installed in compliance with local and national building codes, regulatory restrictions, and FCC rules. For the safety of people and equipment, this product must be installed by a professional technician/installer. ! CAUTION: Before installing, see the important warnings and cautions in “Safety Information” on page 8. INSTALLATION REQUIREMENTS The following items are required for installation: Access Point 8760. Two standard detachable antennas.
CHAPTER 2: INSTALLING THE ACCESS POINT To access and use the Web configuration management system, you need a computer that is running Internet Explorer 5.0 or newer and one of the following operating systems: Windows 2000, or Windows XP. It is recommended that this computer become the dedicated workstation for managing and configuring the access point and the wireless network. POWER REQUIREMENTS The access point complies with the IEEE 802.3af power-over-Ethernet standard.
Deciding Where to Place Equipment and Performing A Site Survey ! CAUTION: The 3Com power supply input relies on a 16A rated building fuse or circuit protector for short circuit protection of the line to neutral conductors. ! CAUTION: It is the responsibility of the installer to ensure that the Power-over-Ethernet (POE) power supply is properly connected.
CHAPTER 2: INSTALLING THE ACCESS POINT Configuring a wireless LAN can be as easy as placing a 3Com Wireless Access Point in a central area and making the necessary connections to the AP and the clients. However, installing multiple Access Points may require more planning.
Connecting the Standard Antennas Figure 1 Front and Rear Panel Description Kensington Lock Slot LEDs POE Port Console Port CONNECTING THE STANDARD ANTENNAS The Access Point 8760 is supplied with standard detachable antennas. These should be attached before the access point is installed. If using an alternate antenna, see “Selecting and Connecting a Different Antenna Model” on page 18. 1 ! Carefully unpack the standard detachable antennas.
CHAPTER 2: INSTALLING THE ACCESS POINT Figure 2 Antenna Adjustment Depending on the coverage required for your site, you may want to replace the standard detachable antennas with one of the external antennas available for use with the access point. See “Selecting and Connecting a Different Antenna Model” on page 18. CONNECTING POWER It is advisable to connect the power and check the Ethernet cables and LEDs before installing the unit in a hard-to-reach location.
Connecting Power If you supply your own Ethernet cable for connecting power, be sure that it is standard category 5 straight-through (8-wire) cable that has not been altered in any way. Use of nonstandard cable could damage the access point.
CHAPTER 2: INSTALLING THE ACCESS POINT USING THE POWER SUPPLY ! CAUTION: To avoid damaging network equipment, make sure that the cables are connected from access point to power supply to LAN as shown above and described below. The power supply can be located at any point between the access point and the LAN access port, wherever a convenient power outlet exists.
Checking the LEDs CHECKING THE LEDS When power is connected, the access point LEDs light. The illustration and the following table describe the LEDs and their functions. Table 1 System LEDs LED Power Link 11a 11g Color Indicates Green The access point is powered up and operating normally. Off The access point is not receiving power or there is a fault with the power supply. Green The access point has a 10/100 Mbps Fast Ethernet connection.
CHAPTER 2: INSTALLING THE ACCESS POINT WALL, CEILING, OR ELECTRICAL BOX MOUNTING To mount the access point to a wall, ceiling, or electrical box: 1 Remove the access point from the mounting bracket. 2 Screw the mounting bracket to a wall, ceiling, or electrical box (NEMA enclosure): If mounting to a solid surface wall or ceiling, use two of the sheet metal screws and two of the wall anchors (included). If mounting to drywall, use two sheet metal screws and two wall anchors (not included).
Wall, Ceiling, or Electrical Box Mounting Figure 4 Routing a Cable Routing a cable Figure 5 Mounting Bracket Installing the mounting bracket 4 Connect the Ethernet cable to the port on the back of the access point.
CHAPTER 2: INSTALLING THE ACCESS POINT FLAT SURFACE INSTALLATION The access point can also be placed on a flat surface such as a table, desktop or filing cabinet. Do not install the access point on any type of metal surface. If you choose a flat surface mount, select a location that is clear of obstructions and provides good reception. Figure 6 Flat Surface Installation NOTE: Regulatory restrictions dictate that when this device is operational, the minimal body-to-antenna distance is 20 cm (8 inches).
Selecting and Connecting a Different Antenna Model Figure 7 Connecting Antennae Side Side 1 Position the antenna so that there are minimal obstacles between it and any client with which it will communicate. While maintaining a direct line of sight between the antenna and a client is not strictly necessary, such an arrangement helps to ensure a strong signal. Ensure that access is available for routing the antenna cable from the antenna to the access point.
CHAPTER 2: INSTALLING THE ACCESS POINT INSTALLING SOFTWARE UTILITIES The installation CD includes documentation and software utilities to help you set up and administer the wireless components of your network. To view product documentation, select View the Documentation from the CD Startup Menu and then select the item you want to view. The software Tools and Utilities include: 3Com Wireless Infrastructure Device Manager.
3 INITIAL CONFIGURATION The Access Point 8760 offers a variety of management options, including a web-based interface. The initial configuration steps can be made through the web browser interface. The access point requests an IP address via DHCP by default. If no response is received from the DHCP server, then the access point uses the default address 169.254.2.1.
CHAPTER 3: INITIAL CONFIGURATION 1 Connect a computer directly to the Access Point using the supplied standard Category 5 UTP Ethernet cable. 2 Enter the Access Point’s default IP address (169.254.2.1) into the computer’s web browser. If the Configuration Management System starts, the Access Point is using the factory assigned IP address.
Figure 1 Wireless Interface Device Manager Click on the Properties button to see the following screen Figure 2 Wireless Interface Device Manager - Properties 3-3
CHAPTER 3: INITIAL CONFIGURATION Directly connect to the device through its Ethernet port or console port. Follow the instructions below to login into the AP Configuration screen: 1 Load a web browser and enter . 2 The Logon screen appears. To log on to the Web interface: 1 Username, type admin (case sensitive). 2 Password, type password 3 Click Log On. FIRST TIME ONLY When you log in for the first time, you may be asked to select your country.
Using the Setup Wizard NOTE: If you changed the default IP address via the command line interface above, use that address instead of the one shown here. Logging In – Enter the username “admin,” and password “password,” then click LOGIN. For information on configuring a user name and password, see page 35.
CHAPTER 3: INITIAL CONFIGURATION The home page displays the Main Menu. Figure 4 Home Page Launching the Setup Wizard – To perform initial configuration, click Setup Wizard on the home page, select the VAP you wish to configure, then click on the [Next] button to start the process.
Using the Setup Wizard 1 Service Set ID – Enter the service set identifier in the SSID box which all wireless clients must use to associate with the access point. The SSID is case sensitive and can consist of up to 32 alphanumeric characters. Figure 6 Setup Wizard - Step 1 2 Radio Channel – You must enable radio communications for 802.11a and 802.11b/g, and set the operating radio channel.
CHAPTER 3: INITIAL CONFIGURATION Figure 7 Setup Wizard - Step 2 802.11a Turbo Mode – If you select Enable, the access point will operate in turbo mode with a data rate of up to 108 Mbps. Normal mode support 13 channels, Turbo mode supports only 5 channels. (Default: Disabled) 802.11a Radio Channel – Set the operating radio channel number. (Default: 60ch, 5.300 GHz) Auto Channel Select – Select Enable for automatic radio channel detection. (Default: Enabled) 802.
Using the Setup Wizard 3 IP Configuration – Either enable or disable Dynamic Host Configuration Protocol (DHCP) for automatic IP configuration. If you disable DHCP, then manually enter the IP address and subnet mask. If a management station exists on another network segment, then you must enter the IP address for a gateway that can route traffic between these segments.
CHAPTER 3: INITIAL CONFIGURATION Figure 9 Setup Wizard - Step 4 Authentication Type – Use “Open System” to allow open access to all wireless clients without performing authentication, or “Shared Key” to perform authentication based on a shared key that has been distributed to all stations. (Default: Open System) WEP – Wired Equivalent Privacy is used to encrypt transmissions passing between wireless clients and the access point.
Using the Setup Wizard 5 Click Finish. 6 Click the OK button to complete the wizard.
CHAPTER 3: INITIAL CONFIGURATION 3-12
4 SYSTEM CONFIGURATION Before continuing with advanced configuration, first complete the initial configuration steps described in Chapter 4 to set up an IP address for the access point. The access point can be managed by any computer using a web browser (such as Internet Explorer 5.0 or above). Enter the configured IP address of the access point, or use the default address: http://169.254.2.1. To log into the access point, enter the default user name “admin” and the password “password,” then press “LOGIN.
CHAPTER 4: SYSTEM CONFIGURATION Figure 11 Advanced Setup The information in this chapter is organized to reflect the structure of the web screens for easy reference. However, it is recommended that you configure a user name and password as the first step under Administration to control management access to this device (page 4-35). ADVANCED SETUP The Advanced Setup pages include the following options.
Advanced Setup Menu Description Page Authentication Configures 802.
CHAPTER 4: SYSTEM CONFIGURATION SYSTEM IDENTIFICATION The system name for the access point can be left at its default setting. However, modifying this parameter can help you to more easily distinguish different devices in your network. Figure 12 System Identification System Name – An alias for the access point, enabling the device to be uniquely identified on the network.
TCP / IP Settings TCP / IP SETTINGS Configuring the access point with an IP address expands your ability to manage the access point. A number of access point features depend on IP addressing to operate. NOTE: You can use the web browser interface to access IP addressing only if the access point already has an IP address that is reachable through your network. By default, the access point will be automatically configured with IP settings from a Dynamic Host Configuration Protocol (DHCP) server.
CHAPTER 4: SYSTEM CONFIGURATION DHCP Client (Enable) – Select this option to obtain the IP settings for the access point from a DHCP (Dynamic Host Configuration Protocol) server. The IP address, subnet mask, default gateway, and Domain Name Server (DNS) address are dynamically assigned to the access point by the network DHCP server. (Default: Enabled) DHCP Client (Disable) – Select this option to manually configure a static address for the access point.
TCP / IP Settings Figure 14 Smart Monitor By enabling Smart Monitor (known as Link Integrity in the CLI) and setting a target IP address, the AP will periodically (set by the ping interval) check to see if the target address responds to pings. If it fails to respond to a ping after the configured number of retries, it will disable both radios so that no clients can connect to the AP.
CHAPTER 4: SYSTEM CONFIGURATION RADIUS Remote Authentication Dial-in User Service (RADIUS) is an authentication protocol that uses software running on a central server to control access to RADIUS-aware devices on the network. An authentication server contains a database of user credentials for each user that requires access to the network. A primary RADIUS server must be specified for the access point to implement IEEE 802.1X network access control and Wi-Fi Protected Access (WPA) wireless security.
RADIUS Figure 15 RADIUS Authentication Primary Radius Server Setup – Configure the following settings to use RADIUS authentication on the access point. IP Address: Specifies the IP address or host name of the RADIUS server. Port: The UDP port number used by the RADIUS server for authentication messages. (Range: 1024-65535; Default: 1812) Key: A shared text string used to encrypt messages between the access point and the RADIUS server.
CHAPTER 4: SYSTEM CONFIGURATION NOTE: For the Timeout and Retransmit attempts fields, accept the default values unless you experience problems connecting to the RADIUS server over the network. Secondary Radius Server Setup – Configure a secondary RADIUS server to provide a backup in case the primary server fails. The access point uses the secondary server if the primary server fails or becomes inaccessible.
Authentication The 802.1X EAP packets are also used to pass dynamic unicast session keys and static broadcast keys to wireless clients. Session keys are unique to each client and are used to encrypt and correlate traffic passing between a specific client and the access point. You can also enable broadcast key rotation, so the access point provides a dynamic broadcast key and changes it at a specified interval. The access point can also operate in a 802.1X supplicant mode.
CHAPTER 4: SYSTEM CONFIGURATION Figure 16 Authentication MAC Authentication – You can configure a list of the MAC addresses for wireless clients that are authorized to access the network. This provides a basic level of authentication for wireless clients attempting to gain access to the network. A database of authorized MAC addresses can be stored locally on the access point or remotely on a central RADIUS server.
Authentication Disabled: No checks are performed on an associating station’s MAC address. Local MAC: The MAC address of the associating station is compared against the local database stored on the access point. Use the Local MAC Authentication section of this web page to set up the local database, and configure all access points in the wireless network service area with the same MAC address database.
CHAPTER 4: SYSTEM CONFIGURATION Broadcast Key Refresh Rate: Sets the interval at which the broadcast keys are refreshed for stations using 802.1X dynamic keying. (Range: 0-1440 minutes; Default: 0 means disabled) Session Key Refresh Rate: The interval at which the access point refreshes unicast session keys for associated clients. (Range: 0-1440 minutes; Default: 0 means disabled) 802.1X Reauthentication Refresh Rate: The time period after which a connected client must be re-authenticated.
Filter Control FILTER CONTROL The access point can employ network traffic frame filtering to control access to network resources and increase security. You can prevent communications between wireless clients and prevent access point management from wireless clients. Also, you can block specific Ethernet traffic from being forwarded by the access point.
CHAPTER 4: SYSTEM CONFIGURATION Prevent Intra VAP client communication: When enabled, clients associated with a specific VAP interface cannot establish wireless communications with each other. Clients can communicate with clients associated to other VAP interfaces. Prevent Inter and Intra VAP client communication: When enabled, clients cannot establish wireless communications with any other client, either those associated to the same VAP interface or any other VAP interface.
Filter Control VLAN The access point can employ VLAN tagging support to control access to network resources and increase security. VLANs separate traffic passing between the access point, associated clients, and the wired network. There can be a VLAN assigned to each associated client, a default VLAN for each VAP (Virtual Access Point) interface, and a management VLAN for the access point.
CHAPTER 4: SYSTEM CONFIGURATION A VLAN ID (1-4094) can be assigned to a client after successful IEEE 802.1X authentication. The client VLAN IDs must be configured on the RADIUS server for each user authorized to access the network. If a client does not have a configured VLAN ID on the RADIUS server, the access point assigns the client to the configured default VLAN ID for the VAP interface. NOTE: When using IEEE 802.1X to dynamically assign VLAN IDs, the access point must have 802.
SNMP SNMP Simple Network Management Protocol (SNMP) is a communication protocol designed specifically for managing devices on a network. Equipment commonly managed with SNMP includes switches, routers and host computers. SNMP is typically used to configure these devices for proper operation in a network environment, as well as to monitor them to evaluate performance or detect potential problems.
CHAPTER 4: SYSTEM CONFIGURATION Figure 19 SNMP SNMP – Enables or disables SNMP management access and also enables the access point to send SNMP traps (notifications). (Default: Disable) Location – A text string that describes the system location. (Maximum length: 255 characters) Contact – A text string that describes the system contact. (Maximum length: 255 characters) Community Name (Read Only) – Defines the SNMP community access string that has read-only access.
SNMP Trap Destination Community Name – The community string sent with the notification operation. (Maximum length: 23 characters, case sensitive; Default: public) Engine ID – Sets the engine identifier for the SNMPv3 agent that resides on the access point. This engine protects against message replay, delay, and redirection. The engine ID is also used in combination with user passwords to generate the security keys for authenticating and encrypting SNMPv3 packets.
CHAPTER 4: SYSTEM CONFIGURATION dot1xMacAddrAuthSuccess - A client station has successfully authenticated its MAC address with the RADIUS server. dot1xMacAddrAuthFail - A client station has failed MAC address authentication with the RADIUS server. dot1xAuthNotInitiated - A client station did not initiate 802.1X authentication. dot1xAuthSuccess - A 802.1X client station has been successfully authenticated by the RADIUS server. dot1xAuthFail - A 802.
Administration Passphrase – The password or key associated with the authentication and privacy settings. A minimum of eight plain text characters is required. Action – Click the Add button to add a new user to the list. Click the edit button to change details of an existing user. Click the Del button to remove a user from the list. NOTE: Users must be assigned to groups that have the same security levels.
CHAPTER 4: SYSTEM CONFIGURATION Figure 22 Administration Username – The name of the user. The default name is “admin.” (Length: 3-16 characters, case sensitive) New Password – The password for management access. (Length: 3-16 characters, case sensitive) Confirm New Password – Enter the password again for verification. TELNET AND SSH SETTINGS Telnet is a remote management tool that can be used to configure the access point from anywhere in the network. However, Telnet is not secure from hostile attacks.
Administration Telnet Server Status: Enables or disables the Telnet server. (Default: Enabled) SSH Server Status: Enables or disables the SSH server. (Default: Enabled) SSH Server Port: Sets the UDP port for the SSH server. (Range: 1-65535; Default: 22) UPGRADING FIRMWARE You can upgrade new access point software from a local file on the management workstation, or from an TFTP server. New software may be provided periodically from your distributor.
CHAPTER 4: SYSTEM CONFIGURATION Figure 24 Firmware Upgrade Before upgrading new software, verify that the access point is connected to the network and has been configured with a compatible IP address and subnet mask.
Administration Obtain the IP address of the FTP or TFTP server where the access point software is stored. If upgrading from an FTP server, be sure that you have an account configured on the server with a user name and password. If VLANs are configured on the access point, determine the VLAN ID with which the FTP or TFTP server is associated, and then configure the management station, or the network port to which it is attached, with the same VLAN ID.
CHAPTER 4: SYSTEM CONFIGURATION IP Address: IP address or host name of the TFTP server. Restore Factory Settings – Click the Restore button to reset the configuration settings for the access point to the factory defaults and reboot the system. Note that all user configured information will be lost. You will have to re-enter the default user name (admin) to re-gain management access to this device. Reboot Access Point – Click the Reset button to reboot the system.
WDS and Spanning Tree Settings Figure 25 WDS and Spanning Tree Settings 4-41
CHAPTER 4: SYSTEM CONFIGURATION WDS Bridge – Up to six WDS bridge or repeater links (MAC addresses) per radio interface can be specified for each unit in the wireless bridge network. One unit only must be configured as the “root bridge” in the wireless network. The root bridge is the unit connected to the main core of the wired LAN. Other bridges need to specify one “Parent” link to the root bridge or to a bridge connected to the root bridge.
WDS and Spanning Tree Settings Figure 26 Spanning Tree Protocol Spanning Tree Protocol – STP uses a distributed algorithm to select a bridging device (STP-compliant switch, bridge or router) that serves as the root of the spanning tree network.
CHAPTER 4: SYSTEM CONFIGURATION from that device to the root device. Then it selects a designated bridging device from each LAN which incurs the lowest path cost when forwarding a packet from that LAN to the root device. All ports connected to designated bridging devices are assigned as designated ports. After determining the lowest cost spanning tree, it enables all root ports and designated ports, and disables all other ports.
WDS and Spanning Tree Settings Bridge Forwarding Delay – The maximum time (in seconds) this device waits before changing states (i.e., discarding to learning to forwarding). This delay is required because every device must receive information about topology changes before it starts to forward frames. In addition, each port needs time to listen for conflicting information that would make it return to a discarding state; otherwise, temporary data loops might result.
CHAPTER 4: SYSTEM CONFIGURATION SYSTEM LOG The access point can be configured to send event and error messages to a System Log Server. The system clock can also be synchronized with a time server, so that all the messages sent to the Syslog server are stamped with the correct time and date. Figure 27 System Log ENABLING SYSTEM LOGGING The access point supports a logging process that can control error messages saved to memory or sent to a Syslog server.
System Log Enter Time Zone – Sets the desired time zone + or - GMT. Enable Daylight Saving – Adjusts the clock for summertime and wintertime. The system allows you to limit the messages that are logged by specifying a minimum severity level. The following table lists the error message levels from the most severe (Emergency) to least severe (Debug). The message levels that are logged include the specified minimum level up to the Emergency level.
CHAPTER 4: SYSTEM CONFIGURATION Secondary Server: The IP address of a secondary SNTP or NTP time server. The access point first attempts to update the time from the primary server; if this fails it attempts an update from the secondary server. NOTE: The access point also allows you to disable SNTP and set the system clock manually. Set Time Zone – SNTP uses Coordinated Universal Time (or UTC, formerly Greenwich Mean Time, or GMT) based on the time at the Earth’s prime meridian, zero degrees longitude.
Radio Interface NOTE: The 8760 Access Point ships from the factory enabled only for channels allowed in the US/Canada. If you live in an area where additional channels are allowed, go to the 3Com web site (http://www.3com.com) and download the latest software that will allow additional channels in your country. 802.11A INTERFACE The IEEE 802.11a interface operates within the 5 GHz band, at up to 54 Mbps in normal mode or up to 108 Mbps in Turbo mode.
CHAPTER 4: SYSTEM CONFIGURATION SSID – The name of the basic service set provided by a VAP interface. Clients that want to connect to the network through the access point must set their SSID to the same as that of an access point VAP interface. (Default: 3Com1 to 3Com4 for 802.11a, 3Com5 to 3Com8 for 802.11b/g; Range: 1-32 characters) Default VLAN ID – The VLAN ID assigned to wireless clients associated to the VAP interface that are not assigned to a specific VLAN by RADIUS server configuration.
Radio Interface CONFIGURING COMMON RADIO SETTINGS To configure common radio settings, select the Radio Settings page, and scroll down to below the VAP radio settings. Figure 29 Radio Settings A and B/G Country Code – The current country code setting. This setting restricts operation of the access point to radio channels and transmit power levels permitted for wireless networks in the specified country. Description – Adds a comment or description to the wireless interface.
CHAPTER 4: SYSTEM CONFIGURATION NOTE: In normal mode, the access point provides a channel bandwidth of 20 MHz, and supports the maximum number of channels permitted by local regulations (e.g., 13 channels for the United States). In Turbo Mode, the channel bandwidth is increased to 40 MHz to support the increased data rate. However, this reduces the number of channels supported (e.g., 5 channels for the United States). NOTE: .Check your country’s regulations to see if Turbo Mode is allowed.
Radio Interface NOTE: The Antenna ID must be selected in conjunction with the Output Antenna to configure proper use of any of the antenna options. Output Antenna – Selects the use of both fixed antennas operating in diversity mode or a single antenna. (Default: Diversity) Both: The radio uses both antennas in a diversity system. Select this method when the Antenna ID is set to "3Com Integrated Antenna" to use the access point's integrated antennas.
CHAPTER 4: SYSTEM CONFIGURATION Delivery Traffic Indication Message (DTIM) – The rate at which stations in sleep mode must wake up to receive broadcast/multicast transmissions. The DTIM interval indicates how often the MAC layer forwards broadcast/multicast traffic, which is necessary to wake up stations that are using Power Save mode. The default value of 1 indicates that the access point will save all broadcast/multicast frames for the Basic Service Set (BSS) and forward them after every beacon.
Radio Interface 802.11B/G INTERFACE The IEEE 802.11g standard operates within the 2.4 GHz band at up to 54 Mbps. Also note that because the IEEE 802.11g standard is an extension of the IEEE 802.11b standard, it allows clients with 802.11b wireless network cards to associate to an 802.11g access point. First configure the radio settings that apply to the individual VAPs (Virtual Access Point) and the common radio settings that apply to all of the 802.11g interfaces.
CHAPTER 4: SYSTEM CONFIGURATION Figure 30 Radio Settings B/G Client Access Mode – Selects the operating mode for the 802.11g wireless interface. (Default: 802.11b+g) 802.11b+g: Both 802.11b and 802.11g clients can communicate with the access point (up to 54 Mbps). 802.11b only: Both 802.11b and 802.11g clients can communicate with the access point, but 802.11g clients can only transfer data at 802.11b standard rates (up to 11 Mbps). 802.11g only: Only 802.
Radio Interface NOTE: In normal mode, the access point supports the maximum number of channels permitted by local regulations (e.g., 11 channels for the United States). In Turbo mode, channel bonding is used to provide the increased data rate. However, this reduces the number of channels available to one (Channel 6). Super Mode – The Atheros proprietary Super G performance enhancements are supported by the access point. These enhancements include bursting, compression, fast frames and dynamic turbo.
CHAPTER 4: SYSTEM CONFIGURATION CONFIGURING WI-FI MULTIMEDIA Wireless networks offer an equal opportunity for all devices to transmit data from any type of application. Although this is acceptable for most applications, multimedia applications (with audio and video) are particularly sensitive to the delay and throughput variations that result from this equal opportunity wireless access method.
Radio Interface WMM Access Categories WMM Designation Description 802.1D Tags AC_BE (AC0) Best Effort Normal priority, medium delay and throughput. Data only affected by long delays. Data from applications or devices that lack QoS capabilities. 0, 3 AC_BK (AC1) Background Lowest priority. Data with no delay or throughput requirements, such as bulk data transfers. 2, 1 Access Category WMM Operation – WMM uses traffic priority based on the four ACs; Voice, Video, Best Effort, and Background.
CHAPTER 4: SYSTEM CONFIGURATION Figure 31 WMM Backoff Times Time CWMin High Priority CWMax AIFS Random Backoff Minimum Wait Time Random Wait Time CWMin Low Priority CWMax AIFS Random Backoff Minimum Wait Time Random Wait Time For high-priority traffic, the AIFSN and CW values are smaller. The smaller values equate to less backoff and wait time, and therefore more transmit opportunities. To configure WMM, select the Radio Settings page, and scroll down to the WMM configuration settings.
Radio Interface Support: WMM will be used for any associated device that supports this feature. Devices that do not support this feature may still associate with the access point. Required: WMM must be supported on any device trying to associated with the access point. Devices that do not support this feature will not be allowed to associate with the access point. WMM Acknowledge Policy – By default, all wireless data transmissions require the sender to wait for an acknowledgement from the receiver.
CHAPTER 4: SYSTEM CONFIGURATION SECURITY The access point is configured by default as an “open system,” which broadcasts a beacon signal including the configured SSID. Wireless clients with an SSID setting of “any” can read the SSID from the beacon and automatically set their SSID to allow immediate connection to the nearest access point.
Security Security Mechanism Client Support Implementation Considerations WPA over 802.1X Requires WPA-enabled system Mode and network card driver (native support provided in Windows XP) • Provides robust security in WPA-only mode (i.e., WPA clients only) • Offers support for legacy WEP clients, but with increased security risk (i.e., WEP authentication keys disabled) • Requires configured RADIUS server • 802.
CHAPTER 4: SYSTEM CONFIGURATION Client Security Combination Configuration Summarya MAC Authenticationb RADIUS Server Dynamic WEP (802.1x) only Authentication: Open System Local, RADIUS, or Disabled Encryption: Enable 802.1x: Required Set 802.1x key refresh and reauthentication rates Yesc 802.1x WPA only Authentication: WPA Local only Encryption: Enable WPA Configuration: Required Cipher Suite: TKIP 802.1x: Required Set 802.
Security Client Security Combination 802.1x WPA-WPA2 Mixed Mode Configuration Summarya MAC Authenticationb Authentication: WPA-WPA2-mixed Local or Disabled Encryption: Enable WPA Configuration: Required Cipher Suite: TKIP 802.1x: Required Set 802.1x key refresh and reauthentication rates WPA-WPA2 Mixed Authentication: WPA-WPA2-PSK-mixed Mode Pre-Shared Key Encryption: Enable WPA Configuration: Required Cipher Suite: TKIP 802.
CHAPTER 4: SYSTEM CONFIGURATION Note that all clients share the same keys, which are used for user authentication and data encryption. Up to four keys can be specified. These four keys are used for all VAP interfaces on the same radio. To set up WEP shared keys, click Radio Settings under 802.11a or 802.11b/g, then select Authentication ‘Shared’. To use all other than WEP shared keys, select Authentication ‘Open.
Security Encryption – Enable or disable the access point to use data encryption (WEP, TKIP, or AES). If this option is selected when using static WEP keys, you must configure at least one key on the access point and all clients. (Default: Disabled) NOTE: You must enable data encryption through the web or CLI in order to enable all types of encryption (WEP, TKIP, or AES) in the access point.
CHAPTER 4: SYSTEM CONFIGURATION Alphanumeric: Enter keys as 5 alphanumeric characters for 64 bit keys, 13 alphanumeric characters for 128 bit keys, or 16 alphanumeric characters for 152 bit keys (802.11a radio only). Key – Selects the key number to use for encryption for each VAP interface. If the clients have all four keys configured to the same values, you can change the encryption key to any of the four settings without having to update the client keys.
Security keys, 26 hexadecimal digits for 128 bit keys, or 32 hexadecimal digits for 152 bit keys (802.11a radio only). This is the default setting. • Alphanumeric: Enter keys as 5 alphanumeric characters for 64 bit keys, 13 alphanumeric characters for 128 bit keys, or 16 alphanumeric characters for 152 bit keys (802.11a radio only). Key – Selects the key number to use for encryption for each VAP interface.
CHAPTER 4: SYSTEM CONFIGURATION keys to encrypt each data packet. TKIP provides further data encryption enhancements by including a message integrity check for each packet and a re-keying mechanism, which periodically changes the master key. WPA Pre-Shared Key Mode (WPA-PSK, WPA2-PSK): For enterprise deployment, WPA requires a RADIUS authentication server to be configured on the wired network.
Security WPA2 Mixed-Mode: WPA2 defines a transitional mode of operation for networks moving from WPA security to WPA2. WPA2 Mixed Mode allows both WPA and WPA2 clients to associate to a common SSID interface. In mixed mode, the unicast encryption cipher (TKIP or AES-CCMP) is negotiated for each client. The access point advertises its supported encryption ciphers in beacon frames and probe responses.
CHAPTER 4: SYSTEM CONFIGURATION Status Information The Status page includes information on the following items: Access Point Status The AP Status window displays basic system configuration settings, as well as the settings for the wireless interface. Figure 36 AP Status AP System Configuration – The AP System Configuration table displays the basic system configuration settings: System Up Time: Length of time the management agent has been up.
