Linksys Essential Troubleshooting for Your WRT54GC Router
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Compact Wireless-G Broadband Router

15.I can’t access my e-mail, web 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 recommended to use MTU 1492.

•If you are having some difficulties, perform the following steps:

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

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

3.Look for the MTU option, and select Manual. In the Size field, enter 1492.

4.Click the Save Settings 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 Power LED keeps flashing.

The Power LED flashes when the device is first powered up. Meantime, the system will boot up itself and check for proper operation. After finishing the checking procedure, the LED stays solid to show that the system is working fine. If the LED keeps flashing 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 settings 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.

•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.

Appendix A: Troubleshooting

50

Common Problems and Solutions

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Contents Wireless- G Word definition How to Use This User GuideCopyright and Trademarks Table of Contents Appendix a Troubleshooting Appendix B Wireless SecurityCommon Problems and Solutions Frequently Asked Questions Appendix C Upgrading Firmware Appendix D Windows HelpRouter’s Back Panel Router’s Front Panel20 Wireless Tab Wireless Client List Introduction WelcomeWhat’s in this Guide? Compact Wireless-G Broadband Router Planning Your Wireless Network Ad-Hoc versus Infrastructure ModeSsid your wireless network’s name Network TopologyPlanning Your Wireless Network Network Layout Broadband an always-on, fast Internet connection Getting to Know the Compact Wireless-G Broadband RouterBack Panel Power Front PanelStand Reset Button Bottom PanelTop Panel Optional Linksys Longer Range Antenna HGA7S TABConnecting the Compact Wireless-G Broadband Router OverviewConnecting Your Network Devices Hardware Installation for Connection to Another Router Connecting Another RouterConnecting Your Network Devices Configuring the Compact Wireless-G Broadband Router Internet Setup How to Access the Web-based UtilitySetup Tab Basic Setup Static IP Connection Type Packet a unit of data sent over a networkNetwork Setup Optional SettingsDhcp Server Settings Setup Tab Ddns Time SettingsSetup Tab MAC Address Clone MAC Address CloneSetup Tab Advanced Routing 12 Setup Tab Advanced Routing GatewayWireless Tab Basic Wireless Settings Wireless NetworkWireless Tab Wireless Security Wireless Security17 Wireless Tab Wireless Security WPA2 Personal Wireless Tab Wireless MAC Filter Wireless MAC FilterWireless Tab Advanced Wireless Settings Advanced WirelessCompact Wireless-G Broadband Router Security Tab Firewall FirewallAccess Restrictions Tab Internet Access Policy Internet Access PolicySecurity Tab VPN Passthrough VPN PassthroughTo create an Internet Access policy 25 Access Restrictions Tab SummaryApplications and Gaming Tab Port Range Forwarding Port Range ForwardingCompact Wireless-G Broadband Router Applications & Gaming Tab Port Range Triggering Port Range TriggeringApplications and Gaming Tab DMZ DMZAdministration Tab Management ManagementBackup and Restore Administration Tab Log LogAdministration Tab Diagnostics DiagnosticsAdministration Tab Factory Defaults Administration Tab Firmware UpgradeFactory Defaults Firmware UpgradeInternet Connection Status Tab RouterRouter Information Dhcp Server Status Tab Local NetworkLocal Network Status Tab Wireless 41 Status Tab WirelessNeed to set a static IP address on a PC Appendix a TroubleshootingCommon Problems and Solutions Compact Wireless-G Broadband Router Open a command prompt. For Windows 98SE and Me Protocol IP Address Enabled Application Application Start ~ End Port Protocol IP Address Enabled Can’t get the Internet game, server, or application to workCompact Wireless-G Broadband Router To start over, I need to set the Router to factory default Need to upgrade the firmwareFirmware upgrade failed, and/or the Power LED is flashing My DSL service’s PPPoE is always disconnectingPower LED keeps flashing Frequently Asked Questions Where is the Router installed on the network?Is IPSec Pass-Through supported by the Router? Does the Router support IPX or AppleTalk?How can I block corrupted FTP downloads? What is DMZ Hosting? What are the advanced features of the Router?Will the Router function in a Macintosh environment? Is the Router cross-platform compatible?What is the Ieee 802.11a standard? What is the Ieee 802.11b standard?What is the Ieee 802.11g standard? What Ieee 802.11a features are supported?What Ieee 802.11b features are supported? What Ieee 802.11g features are supported?What is ad-hoc mode? What is infrastructure mode?What is ISM band? What is Spread Spectrum?What is DSSS? What is FHSS? And what are their differences? What is WEP?How do I reset the Router? How do I resolve issues with signal loss?Security Threats Facing Wireless Networks Appendix B Wireless SecuritySecurity Precautions Appendix B Wireless Security Compact Wireless-G Broadband Router Figure C-1 Administration Tab Firmware Upgrade Appendix C Upgrading FirmwareNetwork Neighborhood/My Network Places Appendix D Windows HelpShared Resources Windows 98SE or Me Instructions Windows 2000 or XP InstructionsFigure E-4 Wireless MAC Filter List For the Router’s Web-based UtilityAppendix F Glossary Compact Wireless-G Broadband Router Compact Wireless-G Broadband Router Compact Wireless-G Broadband Router Compact Wireless-G Broadband Router Compact Wireless-G Broadband Router Compact Wireless-G Broadband Router Appendix G Specifications ModelCertifications Appendix H Warranty Information Limited WarrantyAppendix I Regulatory Information FCC StatementSafety Notices Appendix J Contact Information
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