RoamAbout 802.11 Wireless Networking Guide - Uni-potsdam.de

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RoamAbout802.11 Wireless Networking GuideTMW ir e l es s9034042-02L A N s

NoticeNoticeCabletron Systems reserves the right to make changes in specifications and other information contained in thisdocument without prior notice. The reader should in all cases consult Cabletron Systems to determine whetherany such changes have been made.The hardware, firmware, or software described in this manual is subject to change without notice.IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL, INDIRECT,SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TOLOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR THE INFORMATIONCONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN ADVISED OF, KNOWN, ORSHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES. March 2000 by Cabletron Systems, Inc.All Rights Reserved. Printed in the United States of America.Cabletron Systems, Inc.35 Industrial WayRochester, NH 03867Order Number: 9034042-02Versions Supported: RoamAbout Access Point firmware V5.0 and laterRoamAbout Access Point Manager software V6.0 and laterRoamAbout PC Card driver V4.0 and laterRoamAbout PC Card Station Firmware V4.0 and laterCabletron, Cabletron Systems, NetRider, RoamAbout, the RoamAbout logo, and SmartSWITCH aretrademarks or registered trademarks of Cabletron Systems, Inc.Apple, the Apple logo, Macintosh, and PowerBook are trademarks or registered trademarks of AppleComputer, Inc.Microsoft, Windows, Windows 95, Windows 98, and Windows NT are either trademarks or registeredtrademarks of Microsoft Corporation.Novell and NetWare are registered trademarks of Novell, Inc.IPX/SPX is a trademark of Novell, Inc.PC Card is a trademark of PCMCIA.All other trademarks and registered trademarks are the property of their respective holders.Web Site: http://www.cabletron.com/wirelessi

NoticeGetting HelpFor additional support related to this device or document, contact Cabletron Systems using one ofthe following methods:World Wide Webhttp://www.cabletron.com/wirelessFAX(603) 337-3075Phone(603) 332-9400Internet mailsupport@cabletron.comTo send comments or suggestions concerning this document, contact theCabletron Systems Technical Writing Department via the followingemail address: TechWriting@cabletron.comMake sure to include the document Part Number in the email message.Before calling Cabletron Systems, please have the following information ready:ii Your Cabletron Systems service contract number A description of the problem A description of any action(s) already taken to resolve the problem The serial and revision numbers of all involved Cabletron Systems products in the network A description of your network environment (layout, cable type, and so forth) Network load and frame size at the time of trouble (if known) The device history (i.e., have you returned the device before, is this a recurring problem, and soforth) Any previous Return Material Authorization (RMA) numbers

ContentsPreface1 Wireless Network ConfigurationsWhat a RoamAbout Access Point Provides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Bridging Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -2Other RoamAbout Access Point Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3What a RoamAbout PC Card Provides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Wireless Infrastructure Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Single Access Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Multiple Access Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Wireless Client Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7LAN-to-LAN Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7Point-to-Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Point-to-Multipoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9Ad-Hoc Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13Optional Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14Vehicle-Mount Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14Range Extender Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15Outdoor Antenna Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-162 Understanding Wireless Network CharacteristicsWireless Network Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAC Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Channel Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Transmit Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Auto Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fixed Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12-22-22-32-32-4iii

Table of ContentsCommunications Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Signal Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Noise Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6Data Throughput Efficiency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6AP Density and Roaming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6RTS/CTS Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7Access Point - RTS Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8Wireless Client - Medium Reservation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8802.11 Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9RoamAbout Access Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10RoamAbout Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11Network Operating System Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11RoamAbout Access Point Secure Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11Wired Equivalent Privacy (WEP) Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12SNMP Community Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13Network Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13Wireless Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14Beacons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14Message Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14Protocols and Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15Spanning Tree Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15RoamAbout Access Point SNMP Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-163 Designing and Implementing a Wireless NetworkInfrastructure Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Determining the Coverage Area and Supported Users . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Selecting the Location for a Single Access Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Selecting the Locations for Multiple Access Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Using Multiple Wireless Infrastructure Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5Using an Outdoor Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5LAN-to-LAN Network Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6Ad-Hoc Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7System Requirements for Wireless Clients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8Wireless Network Hardware Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9Wireless Infrastructure Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9LAN-to-LAN Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9Ad-Hoc Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10iv

Table of Contents4 Installing the Wireless Network ToolsRoamAbout Access Point Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Installing the AP Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Using the AP Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Other SNMP Management Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5RoamAbout Access Point Console Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5RoamAbout Client Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6Installing the Client Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6Using the RoamAbout Client Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7Status/Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8Diagnose Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9Link Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9Site Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-115 Configuring the Wireless NetworkConfiguring Access Points in an Infrastructure Network . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2Using the AP Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2Using the Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5Configuring Clients in an Infrastructure Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7Configuring Access Points in a Point-to-Point Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9Using the AP Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10Using the Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12Configuring the Access Point for Point-to-Multipoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13Using the AP Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14Using the Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16Configuring Clients for an Ad-Hoc Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18Showing Current Access Point Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19Showing Current Client Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21Configuring the Transmit Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23RoamAbout Access Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23RoamAbout Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23Configuring the RTS/CTS Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24RTS Threshold on Access Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24Medium Reservation on RoamAbout Clients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24Configuring Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25Setting Default Rate Limiting (Multicast Traffic) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26Configuring Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26Setting Secure Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26v

Table of ContentsSetting Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Configuring the Access Point Console Port for Security . . . . . . . . . . . . . . . . . . . . . . .Setting Spanning Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking the Configuration on Multiple Access Points . . . . . . . . . . . . . . . . . . . . . . . . . . .Resetting the RoamAbout Access Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Modifying the Access Point SNMP Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Changing the IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Changing the SNMP Read/Write Community Name . . . . . . . . . . . . . . . . . . . . . . . . . .Using a Local MAC Addressing Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-275-295-295-305-315-325-325-335-336 Maintaining the Wireless NetworkTesting Radio Communications Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2Using the Access Point Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2Using the Client Utility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3Testing Data Throughput Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4Optimizing RoamAbout Access Point Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6Using Site Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6Using Link Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7Optimizing RoamAbout Outdoor Antenna Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8Logging Measurement Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9Checking the Client RoamAbout PC Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10Monitoring the Access Point Using RMON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11Checking RoamAbout Product Version Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12Upgrading the RoamAbout Access PointFirmware and ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13Using the AP Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13Using the Access Point Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13Using the Access Point Hardware Reset Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14Replacing the PC Card in an Access Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15Upgrading the RoamAbout Miniport Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16Upgrading the Driver for Windows 95 (OSR2) and Windows 98 . . . . . . . . . . . . . . . . 6-16Upgrading the Driver for Windows NT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17Upgrading the Driver for Windows 95 (Early Version) . . . . . . . . . . . . . . . . . . . . . . . . 6-17Removing the RoamAbout Miniport Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18Deleting the RoamAbout Driver Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18Removing the Apple Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20Upgrading the RoamAbout PC Card Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20vi

Table of Contents7 Problem SolvingUsing the Access Point LEDs to Determine the Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2Access Point 2000 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2Access Point (Original) LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7Showing Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13Individually Addressed Frames Sent (TxUnicastFrames) . . . . . . . . . . . . . . . . . . . . . . 7-15Multicast Frames Sent (TxMulticastFrames) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15Fragments Sent (TxFragments) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15Individually Addressed Bytes Sent (TxUnicastOctets) . . . . . . . . . . . . . . . . . . . . . . . . 7-15Multicast Bytes Sent (TxMulticastOctets) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15Deferred Transmissions (TxDeferredTransmissions). . . . . . . . . . . . . . . . . . . . . . . . . . 7-15Signal Retry Frames Sent (TxSingleRetryFrames) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16Multiple Retry Frames Sent (TxMultipleRetryFrames) . . . . . . . . . . . . . . . . . . . . . . . . 7-16Transmit Retry Limit Exceeded Frames (TxRetryLimitExceeded) . . . . . . . . . . . . . . . 7-16Transmit Frames Discarded (TxDiscards) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16Individually Addressed Frames Received (RxUnicastFrames) . . . . . . . . . . . . . . . . . . 7-17Multicast Frames Received (RxMulticastFrames) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17Fragments Received (RxFragments) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17Individually Addressed Bytes Received (RxUnicastOctets) . . . . . . . . . . . . . . . . . . . . 7-17Multicast Bytes Received (RxMulticastOctets) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17Receive FCS Errors (RxFCSErrors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17Receive Buffer Not Available (RxDiscardsNoBuffer) . . . . . . . . . . . . . . . . . . . . . . . . . 7-18Wrong Station Address on Transmit (TxDiscardsWrongSA) . . . . . . . . . . . . . . . . . . . 7-18Receive WEP Errors (RxDiscardsWEPUndecryptable). . . . . . . . . . . . . . . . . . . . . . . . 7-18Receive Message in Message Fragments (RxMessageInMsgFragments) . . . . . . . . . . 7-18Receive Message in Bad Message Fragments (RxMessageInBadMsgFragments) . . . 7-18WEP ICV Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18WEP Excluded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19Displaying Error Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19RoamAbout PC Card LED Activity in a Client. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20Windows Does Not Detect the RoamAbout PC Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-22Client Cannot Connect to the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23Checking the Network Protocols on a Windows System . . . . . . . . . . . . . . . . . . . . . . . . . . 7-24Device Conflict on a Windows System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-26Windows NT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-26Windows 95 or 98. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-28Changing the ISA Adapter Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29Setting and Removing SNMP Trap Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29Setting Upline Dump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30vii

Table of ContentsA RoamAbout Product SpecificationsPC Card and ISA Adapter Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1PC Card Radio Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3Supported Frequency Sub-Bands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5Range Extender Antenna Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6Vehicle-Mount Antenna Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7GlossaryIndexviii

PrefaceA RoamAbout wireless network consists of RoamAbout wireless products, such as theRoamAbout PC Card and RoamAbout Access Point, and other wireless products that usean 802.11 Direct Sequence (DS) compliant radio.This manual describes how to design, install, configure and maintain a RoamAboutwireless network. It also describes how to troubleshoot problems that may arise duringinstallation or operation.Intended AudienceThis manual is intended for the wireless network manager. You should have a basicknowledge of Local Area Networks (LANs) and networking functions.ix

PrefaceAssociated DocumentsThe following lists each RoamAbout product and where to find additional information.These documents are available on the RoamAbout web site About Access PointRoamAbout Access Point 2000 HardwareInstallation GuideRoamAbout Access PointRoamAbout Access Point 2000 HardwareInstallation Quick StartRoamAbout PC CardRoamAbout 802.11 PC Card KitInstallationOn-Line HelpxRoamAbout PC Card MS-DOS/Windows 3.1 DriverRoamAbout 802.11 PC Card MS-DOSand Windows 3.1 Installation GuideRoamAbout Client UtilityOn-Line HelpRoamAbout Access Point ManagerOn-Line HelpRoamAbout Outdoor SolutionRoamAbout Outdoor Antenna SitePreparation and Installation Guide

Chapter 1Wireless Network ConfigurationsThere are three basic RoamAbout wireless network configurations: One or more Access Points connecting wireless clients to a wired network, using theWorkgroup Bridge mode. A wireless client can be any computer with an 802.11Direct-Sequence (DS) compliant radio card. This type of network is referred to as awireless infrastructure network. Two or more Access Points used as a wireless link connecting wired networks. This iscalled a LAN-to-LAN configuration. There are two variations of the RoamAboutLAN-to-LAN configurations:— Point-to-Point which connects two wired networks, using theLAN-to-LAN Endpoint Bridge mode.— Point-to-Multipoint which can connect multiple wired networks, usingthe LAN-to-LAN Multipoint Bridge mode. Wireless clients communicating among themselves without a connection to a wirednetwork. This is called a peer-to-peer or ad-hoc network.Wireless Network Configurations 1-1

What a RoamAbout Access Point ProvidesWhat a RoamAbout Access Point ProvidesThe RoamAbout Access Point is a 2-port bridge. One port connects to an Ethernet LAN.The other port connects to a wireless network. The wireless connection is provided by aRoamAbout 802.11 DS compliant PC Card.Bridging ServicesThe RoamAbout Access Point provides the following bridging services: Store-and-forward capabilityThe Access Point receives, checks, and transmits frames to other LANs, enabling theconfiguration of extended LANs. Frame filtering based on addressUsing the address database and the source and destination addresses from incomingframes, the Access Point isolates the traffic that should not be allowed on other LANs.This action reduces the total data traffic on an extended LAN by not forwarding thepackets that have local destination addresses or packets that are not allowed to beforwarded. This increases bandwidth efficiency. Data Link layer relayThe Access Point operates at the Data Link layer of the Open System Interconnection(OSI) model. Operation at this layer makes the Access Point transparent to theprotocols that use the LAN connectivity service. This protocol transparency is a keyfactor in the extended LAN service. Dynamic address learningThe forwarding and translating process module automatically adds new sourceaddresses to the address database while the Access Point is operating. This reverselearning of the address and port association allows automatic network configurationwithout prior downline loading of configuration data to the Access Point. Addresslearning is protocol and management entity independent.An Aging Timer determines how long an address remains in the database. The timermeasures the time since data was last addressed to or from a particular node. If thetimer lapses without any traffic, the node’s address is removed from the database. TheAging Timer interval can be modified by a Network Management System.1-2 Wireless Network Configurations

What a RoamAbout Access Point Provides Workgroup Bridge modeIn Workgroup Bridge mode, the Access Point communicates with wireless clients. TheAccess Point learns addresses only from the wireless side of the network. The AccessPoint only forwards packets to multicast addresses, broadcast addresses, and knownaddresses on the wireless LAN. The default Aging Timer interval is 32 minutes. LAN-to-LAN Endpoint Bridge modeIn a Point-to-Point configuration, both Access Points are configured as Endpoints.In this mode, the Access Point filters packets based upon their destination address andforwards all packets with unknown addresses. LAN-to-LAN Multipoint Bridge modeThis mode is used where multiple Access Points are configured as dedicated wirelesslinks between LANs in a Point-to-Multipoint configuration. The LAN-to-LANMultipoint option is only available on the Access Point 2000 with V6.0 or laterfirmware. One Access Point must be designated as the Central Access Point. TheCentral Access Point can communicate with up to six other Access Points configuredas Endpoints.In this mode, the Access Point filters packets based upon their destination address andforwards all packets with unknown addresses.NOTEYou must purchase a license with a valid activation key to enable Multipointbridge mode. Contact your Cabletron Representative.Other RoamAbout Access Point FeaturesThe Access Point includes the following features: Communication with any 802.11 Direct Sequence (DS) compliant radio in a wirelessclient. Support for up to 250 wireless users, per Access Point, in an infrastructure network. 802.11 Wired Equivalent Privacy (WEP 40-bit data encryption) and enhanced 128-bitdata encryption. Secure Access, which requires clients to have the correct Wireless Network Namebefore it can join the wireless network.Wireless Network Configurations 1-3

W

Wireless Network Configurations There are three basic RoamAbout wireless network configurations: One or more Access Points connecting wireless clients to a wired network, using the Workgroup Bridge mode. A wireless client can be any computer with an 802.11 Direct-Sequence (DS) compliant radio card. This type of network is referred to as a .

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Thank you for purchasing the ZyXEL AC240, an extreme high-speed 802.11a/b/g/n/ac dual band wireless network adapter! Following common wireless standards (802.11a/b/g/n), the AC240 is also 802.11ac compatible with a data transfer rate of 867Mbps, sixteen times faster than the 802.11g wireless network! 802.11ac also provides wider wireless

IEEE 802.11 Wireless LAN 802.11b 2.4-5 GHz unlicensed radio spectrum up to 11 Mbps direct sequence spread 802.11a 5-6 GHz range up to 54 Mbps 802.11g 24-5 GHz range 6: Wireless and Mobile Networks6-4 spectrum (DSSS) in physical layer all hosts use same chipping code widely deployed, using base stations 2.4 up to 54 Mbps

2.3 802.11g . IEEE 802.11 adopted the 802.11g standard in late 2001. The 802.11g [6] standard is still under development. The 802.11g standard operates in the 2.4 GHz band and provides speeds up to 54 Mbps (with a fallback to 48, 36, 24, 18, 11, 5.5, 2, and 1 Mbps). The 802.11g dif

IS-95, CDMA, GSM 2G UMTS/WCDMA, CDMA2000 3G 802.15 802.11b 802.11a,g UMTS/WCDMA-HSPDA, CDMA2000-1xEVDO 3G cellular enhanced 802.16 (WiMAX) 802.11a,g point-to-point . Wireless and Mobile Networks 6-10 Wireless Network Taxonomy single hop multiple hops infrastructure (e.g., APs) no infrastructure host connects to base station (WiFi, WiMAX .

With the DWL-G510 in your desktop PC, you will have the flexibility of wireless networking speeds tha tsaveyoutimeandmoney. Compatible with 802.11b and 802.11g Devices - Fully compatible with the IEEE 802.11b and 802.11g standards, the DWL-G510 can connect with existing 802.11

Wireless, Mobile Networks 6-3 Elements of a wireless network network infrastructure Wireless, Mobile Networks 6-4 . CDMA, GSM 2.5G: UMTS/WCDMA, CDMA2000 802.11a,g 3G: UMTS/WCDMA-HSPDA, CDMA2000-1xEVDO 4G: LTWE WIMAX 802.11a,g point-to-point 200 802.11n s) Wireless, Mobile Networks 6-8 infrastructure mode !

the Nintendo DS adhered to the IEEE 802.11 standard. The Nintendo DS might utilize the more widely accepted variants 802.11a, 802.11b, or 802.11g, but it is also possible that the DS could exploit the newer variants such as 802.11b or 802.11e. There is also the possibility that Nintendo strayed from the IEEE standards entirely and developed a

Divis ADVANCED ENGINEERING MATHEMATICS 2130002 – 5th Edition Darshan Institute of Engineering and Technology Name : Roll No. : ion :