Linksys WRT54GR manual Appendix B Wireless Security, Security Precautions

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Wireless-G Broadband Router with RangeBooster

Appendix B: Wireless Security

Linksys wants to make wireless networking as safe and easy for you as possible. The current generation of Linksys products provide several network security features, but they require specific action on your part for implementation. So, keep the following in mind whenever you are setting up or using your wireless network.

Security Precautions

The following is a complete list of security precautions to take (at least steps 1 through 5 should be followed):

1.Change the default SSID.

2.Disable SSID Broadcast.

3.Change the default password for the Administrator account.

4.Enable MAC Address Filtering.

5.Change the SSID periodically.

6.Use the highest encryption algorithm possible. Use WPA if it is available. Please note that this may reduce your network performance.

7.Change the WEP encryption keys periodically.

For information on implementing these security features, refer to “Chapter 6: Configuring the Wireless-G Broadband Router with RangeBooster.”

Security Threats Facing Wireless Networks

Wireless networks are easy to find. Hackers know that in order to join a wireless network, wireless networking products first listen for “beacon messages”. These messages can be easily decrypted and contain much of the network’s information, such as the network’s SSID (Service Set Identifier). Here are the steps you can take:

Change the administrator’s password regularly. With every wireless networking device you use, keep in mind that network settings (SSID, WEP keys, etc.) are stored in its firmware. Your network administrator is the only person who can change network settings. If a hacker gets a hold of the administrator’s password, he, too, can change those settings. So, make it harder for a hacker to get that information. Change the administrator’s password regularly.

Appendix B: Wireless Security

NOTE: Some of these security features are available only through the network router or access point. Refer to the router or access point’s documentation for more information.

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Security Precautions

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Contents Wireless- G Word definition How to Use This User GuideCopyright and Trademarks Table of Contents Appendix C Upgrading Firmware Appendix D Windows Help Appendix a TroubleshootingAppendix B Wireless Security Common Problems and Solutions Frequently Asked QuestionsRouter’s Back Panel List of Figures27 Wireless Tab Wireless MAC Filter Welcome IntroductionWhat’s in this User Guide? Wireless-G Broadband Router with RangeBooster Network Topology Planning Your Wireless NetworkAd-Hoc versus Infrastructure Mode Ssid service set identifier your wireless network’s namePlanning Your Wireless Network Network Layout Network devices Back PanelRouter’s LEDs are located on the front panel Front PanelConnecting the Wireless-G Broadband Router with RangeBooster Connecting Your Network Devices Overview Password ScreenInternet Setup Setup Tab Basic SetupPPPoE Connection Type Router IP Time Setting DDNS.com Setup Tab Ddns16 Setup Tab MAC Address Clone Setup Tab MAC Address Clone17 Setup Tab Advanced Routing Setup Tab Advanced RoutingChanges to cancel your changes Wireless Tab Basic Wireless Settings20 Wireless Tab Wireless Security WEP Wireless Tab Wireless Security22 Wireless Tab Wireless Security PSK2 Radius Wireless MAC Filter Wireless Tab Wireless MAC FilterAdvanced Wireless Wireless Tab Advanced Wireless SettingsWireless-G Broadband Router with RangeBooster Web Filters Security Tab FirewallFirewall Internet FilterSecurity Tab VPN Passthrough Access Restrictions Tab Internet Access PolicyInternet Access Policy 33 Internet Policy Summary To create an Internet Access policySingle Port Forwarding Applications and Gaming Tab Single Port Forwarding36 Applications and Gaming Tab Port Range Forward Applications and Gaming Tab Port Range ForwardingPort Triggering Range Applications & Gaming Tab Port Range TriggeringApplications and Gaming Tab DMZ Management Administration Tab ManagementBackup and Restore Log Administration Tab Log42 Administration Tab Diagnostics Administration Tab DiagnosticsAdministration Tab Firmware Upgrade Administration Tab Factory DefaultsInternet Connection Status Tab RouterRouter Information Status Tab Local Network Status Tab Wireless NetworkNeed to set a static IP address on a PC Appendix a TroubleshootingCommon Problems and Solutions Wireless-G Broadband Router with RangeBooster Open a command prompt. For Windows 98SE and Me TCP Application Start and End Protocol IP Address EnabledCan’t get the Internet game, server, or application to work Wireless-G Broadband Router with RangeBooster My DSL service’s PPPoE is always disconnecting To start over, I need to set the Router to factory defaultNeed to upgrade the firmware Firmware upgrade failed, and/or the Power LED is flashingPower LED keeps flashing Is IPSec Pass-Through supported by the Router? Frequently Asked QuestionsWhere is my SecureEasySetup button? Where is the Router installed on the network?Does the Router support ICQ send file? What is Network Address Translation and what is it used for?How can I block corrupted FTP downloads? Is the Router cross-platform compatible? What is DMZ Hosting?What are the advanced features of the Router? What is the Ieee 802.11g standard?What is ad-hoc mode? What is the Ieee 802.11b standard?What Ieee 802.11g features are supported? What Ieee 802.11b features are supported?What is DSSS? What is FHSS? And what are their differences? What is ISM band?What is Spread Spectrum? How do I resolve issues with signal loss? What is WEP?What is a MAC Address? How do I reset the Router?Security Threats Facing Wireless Networks Appendix B Wireless SecuritySecurity Precautions Appendix B Wireless Security Wireless-G Broadband Router with RangeBooster Appendix C Upgrading Firmware Figure C-1 Upgrade FirmwareNetwork Neighborhood/My Network Places Appendix D Windows HelpShared Resources Windows 2000 or XP Instructions Windows 98SE or Me InstructionsFigure E-4 MAC Address Filter List For the Router’s Web-based UtilityAppendix D Glossary Wireless-G Broadband Router with RangeBooster Wireless-G Broadband Router with RangeBooster Wireless-G Broadband Router with RangeBooster Wireless-G Broadband Router with RangeBooster Standards Appendix G SpecificationsModel Storage Humidity Storage TempOperating Humidity Limited Warranty Appendix H Warranty InformationFCC Statement Appendix G Regulatory InformationWireless-G Broadband Router with RangeBooster Wireless-G Broadband Router with RangeBooster Wireless-G Broadband Router with RangeBooster Wireless-G Broadband Router with RangeBooster Wireless-G Broadband Router with RangeBooster Appendix J Contact Information