Linksys HG200 manual Appendix B Wireless Security, Security Precautions

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Home Wireless-G Gateway

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 Home Wireless-G Gateway.”

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 gateway, router, or access point. Refer to the gateway, router, or access point’s documentation for more information.

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Security Precautions

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Contents 4802GHz.11g Home Wireless-G Word definition How to Use this GuideCopyright and Trademarks Table of Contents Ethernet Adapter Ports and Reset Button on Side Panel Network23 Internet Access Introduction WelcomeWhat’s in this User Guide? Home Wireless-G Gateway Planning Your Network Gateway’s FunctionsIP Addresses What’s an IP Address?Dhcp Dynamic Host Configuration Protocol Servers Dynamic IP AddressesGetting to Know the Home Wireless-G Gateway Ports and Reset Button on Side PanelWireless LEDs on Side PanelBottom Panel Bottom Panel with Stand in Closed PositionConnecting the Home Wireless-G Gateway OverviewWired Connection to a Computer Connect the Adsl LineWireless Connection to a Computer Wireless Configuring the Home Wireless-G GatewaySetup Access Restrictions AdministrationSecurity Applications & GamingHow to Access the Web-based Utility Setup TabBasic Setup Tab Internet SetupRFC 1483 Bridged Dynamic IP Static IPRFC 1483 Routed RFC 1483 RoutedRFC 2516 PPPoE RFC 2364 PPPoANetwork Setup Bridged Mode OnlyOptional Settings required by some ISPs Configuring the Home Wireless-G Gateway Setup Tab TZO.com Ddns TabDynDNS.org Advanced Routing Tab Advanced Routing13 Routing Table Wireless Network Wireless TabBasic Wireless Settings Tab Wireless Security Tab 15 Pre-Shared Key16 WEP Wireless Access Tab Wireless Network AccessAdvanced Wireless Settings Tab Advanced WirelessSecurity Tab VPN PassthroughFirewall Additional FiltersBlock WAN Requests 22 Firewall LogAccess Restrictions Tab Internet Access Tab25 List of PCs Single Port Forwarding Applications and Gaming TabSingle Port Forwarding Tab Port Range Forwarding Tab 28 Port Range ForwardingPort Triggering Tab 29 Port TriggeringDMZ Tab 30 DMZApplication-based QoS QoS TabQoS Management Tab Administration TabGateway Access UPnP IGMP-ProxyEmail Alerts Reporting TabReporting Diagnostics Tab Backup&Restore TabBackup Configuration Restore ConfigurationUpgrade from LAN Factory Defaults TabFirmware Upgrade Tab Reboot Tab RebootStatus Tab Gateway TabGateway Information Internet ConnectionLocal Network Tab 42 Local Network45 Wireless PVC Connection DSL Connection TabDSL Status Need to set a static IP address on a computer Appendix a TroubleshootingCommon Problems and Solutions Want to test my Internet connection Home Wireless-G Gateway Home Wireless-G Gateway TCP UDP Can’t get the Internet game, server, or application to work To start over, I need to set the Gateway 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 flashes continuously Frequently Asked Questions Where is the Gateway installed on the network?Is IPSec Passthrough supported by the Gateway? Does the Gateway support IPX or AppleTalk?What is Network Address Translation and what is it used for? Does the Gateway support ICQ send file?What is DMZ Hosting? What are the advanced features of the Gateway? What is the Ieee 802.11g standard?Is the Gateway cross-platform compatible? How many ports can be simultaneously forwarded? What Ieee 802.11b and 802.11g features are supported? What is ad-hoc mode? What is infrastructure mode? What is roaming?What is the ISM band? What is Spread Spectrum?What is DSSS? What is FHSS? And what are their differences? What is WEP?Have excellent signal strength, but I cannot see my network How do I reset the Gateway?How do I resolve issues with signal loss? Security Threats Facing Wireless Networks Appendix B Wireless SecuritySecurity Precautions Appendix B Wireless Security Home Wireless-G Gateway Figure C-1 IP Configuration Screen Windows 98 or Me InstructionsWindows 2000 or XP Instructions Figure C-3 MAC Address/Physical AddressFigure D-1 Firmware Upgrade Appendix D Upgrading FirmwareAppendix E Glossary Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Appendix F Regulatory Information Radio EN 300 EMC EN 301 489-1, EN 301 Safety EN Belgium Applicable Power Levels in France Location Frequency Range MHz Power EirpWireless Adapters Open the Wireless Network Connection windowHome Wireless-G Gateway Appendix G Warranty Information Lite, G.922.3, G.992.5, T1.413i2 Appendix H SpecificationsModel Number HG200 Standards Operating Humidity Outside of Europe Mail Address Appendix I Contact InformationEurope Mail Address