Linksys WRT54GX manual Appendix B Wireless Security, Security Precautions

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Wireless-G Broadband Router with SRX

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 5: Configuring the Wireless-G Broadband Router.”

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 802 GHz .11g Wireless- G How to Use This User Guide Copyright and TrademarksWord definition Table of Contents Appendix a Troubleshooting Appendix B Wireless SecurityCommon Problems and Solutions Frequently Asked Questions Router’s Back Panel Router’s Reset Button27 Port Services Welcome IntroductionWhat’s in this Guide? Wireless-G Broadband Router with SRX Ad-Hoc versus Infrastructure Mode Planning Your Wireless NetworkNetwork Topology Network LayoutPlanning Your Wireless Network Network Layout Back Panel Getting to Know the Wireless-G Broadband RouterDMZ Front PanelOverview Connecting the Wireless-G Broadband RouterPassword Screen Configuring the Wireless-G Broadband RouterInternet Setup Setup Tab Basic SetupStatic IP Connection Type Pptp Connection Type Packet a unit of data sent over a network Network SetupNetwork Address Server Settings Dhcp 12 Setup Tab Ddns Setup Tab Ddns13 Setup Tab MAC Address Clone Setup Tab MAC Address Clone14 Setup Tab Advanced Routing Setup Tab Advanced Routing16 Wireless Tab Basic Wireless Settings Wireless Tab Basic Wireless SettingsWPA Radius Wireless Tab Wireless SecurityWEP 20 Wireless Tab Wireless MAC Filter Wireless Tab Wireless MAC Filter22 Wireless Tab Advanced Wireless Settings Wireless Tab Advanced Wireless Settings23 Security Tab Firewall Security Tab FirewallTo create an Internet Access policy Access Restrictions Tab Internet AccessUrl the address of a file located on the Internet Ftp a protocol used to transfer files over a TCP/IP networkApplications and Gaming Tab Port Triggering Applications and Gaming Tab Port Range ForwardApplications and Gaming Tab DMZ Applications and Gaming Tab UPnP ForwardingUPnP Forwarding Snmp Administration Tab ManagementAdministration Tab Log Administration Tab DiagnosticsUPnP Administration Tab Firmware Upgrade Administration Tab Factory DefaultsAdministration Tab Config Management Status Tab RouterIsp your internet provider 39 Status Tab Local Network Status Tab Local NetworkEncryption encoding data transmitted in a network Status Tab WirelessSystem Performance Status Tab System PerformanceWireless-G Broadband Router with SRX Appendix a Troubleshooting Common Problems and SolutionsNeed to set a static IP address on a PC For Windows 98SE, Me, 2000, and XP 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 SRX My power LED will not stop flashing 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 flashingCannot connect to the Internet How do I turn on SRX on my router? My wireless-G speed seems to be slowWhere is the Router installed on the network? Frequently Asked QuestionsIs IPSec Pass-Through supported by the Router? Does the Router support IPX or AppleTalk?How can I block corrupted FTP downloads? What are the advanced features of the Router? What is DMZ Hosting?Will the Router function in a Macintosh environment? Is the Router cross-platform compatible?What Ieee 802.11b features are supported? What is the Ieee 802.11g standard?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 a MAC Address? What is WEP?How do I reset the Router? How do I resolve issues with signal loss?Appendix B Wireless Security Security PrecautionsSecurity Threats Facing Wireless Networks Appendix B Wireless Security Wireless-G Broadband Router with SRX Appendix C Upgrading Firmware Figure C-1 Upgrade FirmwareAppendix D Windows Help Shared ResourcesNetwork Neighborhood/My Network Places Windows 98SE or Me Instructions Figure E-1 IP Configuration ScreenFor the Router’s Web-based Utility Windows 2000 or XP InstructionsAppendix F Glossary Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Appendix G Specifications ModelStandards Storage Temp Limited Warranty Appendix H Warranty InformationFCC Statement Appendix I Regulatory InformationFrance Appendix J Contact Information