Linksys WRT51AB manual Click the Advanced = Filters tab, Frequently Asked Questions

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Instant Wireless® Series

15.I can’t access my e-mail, web, or VPN, or I am getting corrupted data from the Internet.

The Maximum Transmission Unit (MTU) setting may need to be adjusted. By default, the MTU is set at 1500. For most DSL users, it is strongly recom- mended to use MTU 1492. If you are having some difficulties, perform the fol- lowing steps:

A. To connect to the Router, go to the web browser, and enter http://192.168.1.1 or the IP address of the Router.

B.Enter the password, if asked. (The default password is admin.)

C.Click the Advanced => Filters tab.

D.Look for the MTU option, and select Enable. In the Size field, enter 1492.

E.Click the Apply button to continue.

If your difficulties continue, change the Size to different values. Try this list of values, one value at a time, in this order, until your problem is solved:

1462

1400

1362

1300

16.The Diag LED stays lit continuously.

The Diag LED lights up when the device is first powered up. Meantime, the system will boot up itself and check for proper operation. After fin- ishing the checking procedure, the LED turns off to show that the system is working fine. If the LED remains lit after this time, the device is not working properly. Try to flash the firmware by assigning a static IP address to the computer, and then upgrade the firmware. Try using the following settings, IP Address: 192.168.1.50 and Subnet Mask: 255.255.255.0.

17.When I enter a URL or IP address, I get a time-out error or am prompted to retry.

Check if other PCs work. If they do, ensure that your workstation’s IP set- tings are correct (IP Address, Subnet Mask, Default Gateway, and DNS). Restart the computer that is having a problem.

If the PCs are configured correctly, but still not working, check the Router. Ensure that it is connected and powered on. Connect to it and check its settings. (If you cannot connect to it, check the LAN and power connections.)

If the Router is configured correctly, check your Internet connection (DSL/cable modem, etc.) to see if it is working correctly. You can remove the Router to verify a direct connection.

Dual-Band Wireless A+B Broadband Router

Manually configure the TCP/IP settings with a DNS address provided by your ISP.

Make sure that your browser is set to connect directly and that any dial- up is disabled. For Internet Explorer, click Tools, Internet Options, and then the Connection tab. Make sure that Internet Explorer is set to Never dial a connection. For Netscape Navigator, click Edit, Preferences, Advanced, and Proxy. Make sure that Netscape Navigator is set to Direct connection to the Internet.

18.The Full/Col LED keeps flickering continuously.

Check the Category 5 Ethernet network cable and its RJ-45 connectors.

There may be interference with other network devices. Try removing other PCs or network devices to see if the problem persists. Eliminate each network device one at a time to determine the cause.

Frequently Asked Questions

What is the maximum number of IP addresses that the Router will support?

The Router will support up to 253 IP addresses.

Is IPSec Pass-Through supported by the Router?

Yes, it is a built-in feature that the Router automatically enables.

Where is the Router installed on the network?

In a typical environment, the Router is installed between the cable/DSL modem and the LAN. Plug the Router into the cable/DSL modem’s Ethernet port.

Does the Router support IPX or AppleTalk?

No. TCP/IP is the only protocol standard for the Internet and has become the global standard for communications. IPX, a NetWare communications protocol used only to route messages from one node to another, and AppleTalk, a com- munications protocol used on Apple and Macintosh networks, can be used for LAN to LAN connections, but those protocols cannot connect from the Internet to a LAN.

Does the Internet connection of the Router support 100Mbps Ethernet?

The Router’s current hardware design supports up to 100Mbps Ethernet on its Internet port; however, the Internet connection speed will vary depending on the speed of your broadband connection. The Router also supports 100Mbps over the auto-sensing Fast Ethernet 10/100 switch on the LAN side of the Router.

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Contents Dual-Band Wireless A+B Broadband Router Copyright & Trademarks Table of Contents Common Problems and Solutions Frequently Asked Questions IntroductionEnvironmental 127 IP Addresses FeaturesRouter’s Functions What’s an IP Address?Dhcp Dynamic Host Configuration Protocol Servers Router Setup OverviewDynamic IP Addresses Getting to Know the Dual-Band Wireless A+B Broadband Router Router’s Back PanelRouter’s Front Panel LEDs LAN Indicators Internet IndicatorsProceed to Connect the Router Wired Connection to a PC Connect the RouterOverview 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 Static or Fixed IP Address Automatic Configuration DhcpEnter the Default Gateway 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 MAC Filter To set up a filter Private IP 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 Need to set a static IP address on a PC Appendix a TroubleshootingCommon Problems and Solutions For Windows NTFor Windows XP Want to test my Internet connectionFor 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 Firmware upgrade failed, and/or the Diag LED is flashing To start over, I need to set the Router to factory defaultNeed to upgrade the firmware 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 the Ieee 802.11a standard? What is DMZ Hosting?What are the advanced features of the Router? What is the Ieee 802.11b standard?What is infrastructure mode? What Ieee 802.11b features are supported?What is ad-hoc mode? What is roaming?How do I reset the Router? What is WEP?What is a MAC Address? 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 AddressAppendix C Configuring Wireless Security Step Two Pinging for a Web AddressBackground 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 Category 5 Ethernet Network Cable or better Appendix F SpecificationsOne 10/100 RJ-45 Port for Cable/DSL Modem EnvironmentalAppendix H Contact Information Appendix G Warranty InformationSales Information Technical Support RMA Issues Fax Web site FTP siteCopyright 2002 Linksys, All Rights Reserved