Linksys WRT54GP2 manual Security Threats Facing Wireless Networks

Page 86

Wireless-G Broadband Router with 2 Phone Ports

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.

SSID. There are several things to keep in mind about the SSID:

1.Disable Broadcast

2.Make it unique

3.Change it often

Most wireless networking devices will give you the option of broadcasting the SSID. While this option may be more convenient, it allows anyone to log into your wireless network. This includes hackers. So, don’t broadcast the SSID.

Wireless networking products come with a default SSID set by the factory. (The Linksys default SSID is “linksys”.) Hackers know these defaults and can check these against your network. Change your SSID to something unique and not something related to your company or the networking products you use.

78	Appendix B: Wireless Security
	Security Threats Facing Wireless Networks

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Contents

Wireless- G Page Word definition How to Use this GuideCopyright and Trademarks Wireless-G Broadband Router with 2 Phone Ports Table of Contents Appendix C Finding the MAC Address Vonage LinksysList of Figures Wireless Security WEPWireless Network Access 39 Status Tab Local Network Introduction WelcomeWhat’s in this Guide? Introduction What’s in this Guide? Wireless-G Broadband Router with 2 Phone Ports Ssid your wireless network’s name Planning Your Wireless NetworkAd-Hoc versus Infrastructure Mode Network TopologyNetwork Layout Getting to Know the Router Back PanelFront Panel WlanConnecting the Router OverviewConnection Instructions Connect a PCConfiguring the Router Security SetupWireless Applications & Gaming AdministrationVoice How to Access the Web-based Utility StatusInternet Connection Type Setup Tab Basic SetupInternet Setup Obtain an IP automaticallyStatic IP PPPoE Pptp Heart Beat Signal Router IP Network SetupOptional Settings Packet a unit of data sent over a networkNetwork Address Server Settings Dhcp Setup Tab Ddns Time SettingDynDNS.org TZO.comSetup Tab MAC Address Clone MAC CloneSetup Tab Advanced Routing Advanced Routing13 Routing Table Entry List Wireless Tab Basic Wireless Settings Wireless Tab Wireless Security 15 Wireless Tab Wireless Security WPA Pre-Shared Key16 Wireless Tab Wireless Security WPA Radius Wireless Tab Wireless Network Access 18 Wireless Tab Wireless Network AccessWireless Tab Advanced Wireless Settings 20 Advanced Wireless SettingsWireless-G Broadband Router with 2 Phone Ports Filter Port Range Security Tab FilterFilter IP Address Range Filter MAC AddressBlock WAN Requests Internet requestsSecurity Tab VPN Passthrough VPN PassthroughPort Range Forwarding Voice TabApplications & Gaming Tab Port Range Forwarding Port Range26 Applications & Gaming Tab Port Triggering Forwarded Range Applications & Gaming Tab UPnP ForwardingUPnP Forwarding Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Applications & Gaming Tab DMZ DMZApplications & Gaming Tab QoS Application-based QoSPort-based QoS Specific Port# fieldsVoice QoS Local Router Access Administration Tab ManagementRouter Password Remote Router AccessBackup and Restore UPnPAdministration Tab Log LogRuns a networking device Administration Tab Factory DefaultsAdministration Tab Firmware Upgrade Firmware with a newer versionLine1 Status Status Tab VoiceInformation Line2 StatusStatus Tab Router 38 Status Tab RouterStatus Tab Local Network Local NetworkStatus Tab Wireless Appendix a Troubleshooting Common Problems and SolutionsFor Windows 98 and Millennium Need to set a static IP address on a PCFor Windows For Windows XPWant to test my Internet connection For Windows XP Wireless-G Broadband Router with 2 Phone Ports Am not able to access the Router’s Web-based Utility Setup Need to set up a server behind my Router Application Start and End Protocol IP Address Enabled TCPCan’t get the Internet game, server, or application to work Appendix a Troubleshooting Common Problems and Solutions For Microsoft Internet Explorer 5.0 or higher To start over, I need to set the Router to factory defaultMy DSL service’s PPPoE is always disconnecting For Netscape 4.7 or higherWireless-G Broadband Router with 2 Phone Ports Go through this checklist until your problem is solved Frequently Asked Questions What is Network Address Translation and what is it used for? How can I block corrupted FTP downloads? Will the Router function in a Macintosh environment? If all else fails in the installation, what can I do?What is DMZ Hosting? Which modems are compatible with the Router? Is the Router cross-platform compatible?How many ports can be simultaneously forwarded? How can I check whether I have static or Dhcp IP addresses?What Ieee 802.11b features are supported? What is the Ieee 802.11b standard?What is the Ieee 802.11g standard? What is infrastructure mode? What Ieee 802.11g features are supported?What is ad-hoc mode? What is roaming?What is ISM band? What is Spread Spectrum? What is WPA? What is DSSS? What is FHSS? And what are their differences? What is WEP? What is a MAC Address?Have excellent signal strength, but I cannot see my network How many channels/frequencies are available with the Router?Appendix B Wireless Security Security PrecautionsSecurity Threats Facing Wireless Networks Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Figure C-1 IP Configuration Screen Windows 98 or Me InstructionsWindows 2000 or XP Instructions For the Router’s Web-based UtilityNetwork Neighborhood/My Network Places Appendix D Windows HelpShared Resources Appendix D Windows Help Appendix E Glossary Appendix E Glossary Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Voice Protocol Appendix F SpecificationsModel UPnP able/cert CertifiedDimensions 32 x 1.89 x H x D Appendix G Warranty Information Limited WarrantyAppendix G Warranty Information Appendix H Regulatory Information FCC StatementSafety Notices Need to contact Vonage? VonageLinksys Hour 1-VONAGE-HELPLinksys

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