Linksys WRT51AB manual 5GHz, 802.11a, Advanced Wireless

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Instant Wireless® Series

Advanced Wireless

The Advanced Wireless screen allows you to customize data transmission set- tings and access the 802.1x Configuration screen. In most cases, the advanced wireless settings on this screen should remain at their default values.

Figure 6-19

5GHz, 802.11a

Beacon Interval The Beacon Interval value indicates the frequency interval of the beacon. Enter a value between 20 and 1000. A beacon is a packet broadcast by the Router to synchronize the wireless network. The default value is 100.

Dual-Band Wireless A+B Broadband Router

DTIM Interval This value, between 1 and 16384, indicates the interval of the Delivery Traffic Indication Message (DTIM). A DTIM field is a countdown field informing clients of the next window for listening to broadcast and mul- ticast messages. When the Router has buffered broadcast or multicast messages for associated clients, it sends the next DTIM with a DTIM Interval value. Its clients hear the beacons and awaken to receive the broadcast and multicast mes- sages. The default value is 1.

RTS Threshold Should you encounter inconsistent data flow, only minor reduction of the default value, 2346, is recommended. If a network packet is smaller than the preset RTS threshold size, the RTS/CTS mechanism will not be enabled. The Router sends Request to Send (RTS) frames to a particular receiving station and negotiates the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS) frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value of 2346.

Fragmentation Threshold This value specifies the maximum size for a pack- et before data is fragmented into multiple packets. If you experience a high packet error rate, you may slightly increase the Fragmentation Threshold. Setting the Fragmentation Threshold too low may result in poor network per- formance. Only minor reduction of the default value is recommended. In most cases, it should remain at its default value of 2346.

Transmission Rate The rate of data transmission should be set depending on the speed of your wireless network. You can select from a range of transmission speeds (6, 9, 12, 18, 24, 36, 48, or 54Mbps), or you can select Best to have the Router automatically use the fastest possible data rate and enable the Auto- Fallback feature. Auto-Fallback will negotiate the best possible connection speed between the Router and a wireless client. The default value is Best.

Transmit Power The greater the transmit power used, the larger the area a wireless network covers. To minimize the likelihood of eavesdropping by unau- thorized wireless users, do not use more transmit power than necessary to cover the range needed for your wireless network. Try using the Router at different levels of transmit power, and determine how much transmit power is needed to reach the wireless client, such as a PC, or access point that is farthest from the Router. Then select the appropriate level of transmit power (Full, Half, Quarter, Eighth, or Min) from the drop-down menu. The default value is Full.

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Contents Dual-Band Wireless A+B Broadband Router Copyright & Trademarks Table of Contents Introduction Common Problems and Solutions Frequently Asked QuestionsEnvironmental 127 Features Router’s FunctionsIP Addresses What’s an IP Address?Router Setup Overview Dhcp Dynamic Host Configuration Protocol ServersDynamic IP Addresses Router’s Back Panel Getting to Know the Dual-Band Wireless A+B Broadband RouterRouter’s Front Panel LEDs Internet Indicators LAN IndicatorsProceed to Connect the Router Connect the Router Wired Connection to a PCOverview Configure the PCs Wireless Connection to a PCConfiguring Windows 98 and Millennium PCs Go to Configure the Router’s Basic SettingsConfiguring Windows 2000 PCs Configuring Windows XP PCs Configure the Router’s Basic Settings Automatic Configuration Dhcp Enter the Default GatewayStatic or Fixed IP Address Enter the Internet IP AddressHow to Access the Web-based Utility Router’s Web-based UtilityAutomatic Configuration Dhcp SetupStatic IP Pptp 5GHz, 802.11a 5GHz, 802.11a WEP 4GHz, 802.11b WEP Password StatusLAN Dhcp Log HelpAdvanced Tabs Advanced Wireless 5GHz, 802.11a802.1x Configuration Radius Server Filters Private IP Filter Private MAC Filter To set up a filter11-20 , 21-30 , 31-40 , or 41-50 from Applications External Port TCP Protocol UDP Protocol Port ForwardingRouting Click the Delete This Entry buttonDMZ Host MAC Address Clone Appendix a Troubleshooting Common Problems and SolutionsNeed to set a static IP address on a PC For Windows NTWant to test my Internet connection For Windows XPFor Windows 98, Me, 2000, and XP Need to set up a server behind my Router TCP UDPCan’t get the Internet game, server, or application to work To start over, I need to set the Router to factory default Need to upgrade the firmwareFirmware upgrade failed, and/or the Diag LED is flashing My DSL service’s PPPoE is always disconnectingFrequently Asked Questions Click the Advanced = Filters tabDoes the Router support ICQ send file? How can I block corrupted FTP downloads?What is DMZ Hosting? What are the advanced features of the Router?What is the Ieee 802.11a standard? What is the Ieee 802.11b standard?What Ieee 802.11b features are supported? What is ad-hoc mode?What is infrastructure mode? What is roaming?What is WEP? What is a MAC Address?How do I reset the Router? How do I resolve issues with signal loss?Appendix B How to Ping Your ISP’s E-mail & Web Addresses Step One Pinging an IP AddressStep Two Pinging for a Web Address Appendix C Configuring Wireless SecurityBackground 802.1x Authentication WEP EncryptionMD5 Authentication for Windows XP Figure C-2Figure C-5 Digital Certificate Installation Figure C-9Click Install this certificate Figure C-13TLS Authentication for Windows XP Figure C-18Figure C-21 Figure C-25 For Windows 95, 98, and MeFigure D-3 For Windows NT, 2000, and XPAppendix E Glossary 111 113 115 117 119 121 123 125 Appendix F Specifications One 10/100 RJ-45 Port for Cable/DSL ModemCategory 5 Ethernet Network Cable or better EnvironmentalAppendix G Warranty Information Sales Information Technical Support RMA Issues FaxAppendix H Contact Information Web site FTP siteCopyright 2002 Linksys, All Rights Reserved
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