Linksys WRT51AB manual Dynamic IP Addresses, Dhcp Dynamic Host Configuration Protocol Servers

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Instant Wireless® Series

Dynamic IP Addresses

A dynamic IP address is automatically assigned to a device on the network, such as PCs and print servers. These IP addresses are called “dynamic” because they are only temporarily assigned to the PC or device. After a certain time period, they expire and may change. If a PC logs onto the network (or the Internet) and its dynamic IP address has expired, the DHCP server will auto- matically assign it a new dynamic IP address.

DHCP (Dynamic Host Configuration Protocol) Servers

PCs and other network devices using dynamic IP addressing are assigned a new IP address by a DHCP server. The PC or network device obtaining an IP address is called the DHCP client. DHCP frees you from having to assign IP addresses manually every time a new user is added to your network.

A DHCP server can either be a designated PC on the network or another net- work device, such as the Router. By default, the Router’s DHCP Server func- tion is enabled.

If you already have a DHCP server running on your network, you must disable one of the two DHCP servers. If you run more than one DHCP server on your network, you will experience network errors, such as conflicting IP addresses. To disable DHCP on the Router, see the DHCP section in “Chapter 6: The Router’s Web-based Utility.”

Note: Even if you assign a static IP address to a PC, other PCs can still use DHCP’s dynamic IP addressing, as long as the static IP address is not within the DHCP range of the LAN IP Addresses.

If the dynamic IP addressing fails to provide a dynamic IP address, refer to “Appendix A: Troubleshooting.”

Router Setup Overview

Note: You should always you run the Setup Wizard CD-ROM to con- figure the Router for Internet access. If you wish to manually config- ure the Router, you may follow the instructions in the Quick Installation guide or this User Guide.

Dual-Band Wireless A+B Broadband Router

This User Guide covers the steps for setting up a network with the Router. After going through “Chapter 2: Getting to Know the Dual-Band Wireless A+B Broadband Router,” most users will only need to use the following chapters:

•Chapter 3: Connect the Router

This chapter instructs you on how to connect a cable or DSL modem to the Router and connect your PC(s) to the Router.

Notebook with

Wireless Adapter

Notebook with

Wireless Adapter

Cable or DSL Modem

Router

PC with

Ethernet

Adapter

Figure 1-1

•Chapter 4: Configure the PCs

This chapter instructs you on how to configure your PCs to be DHCP clients, if you have previously set static IP addresses on your PCs.

•Chapter 5: Configure the Router’s Basic Settings

This chapter explains how to configure the Router using your web browser and the Router’s web-based utility. You will configure the Router for Internet access using the settings provided by your ISP.

When you’re finished with these basic steps, you will be ready to connect to the Internet. You can also modify the Router’s settings further; for example, you can adjust security features and other settings to enable online gaming (see “Chapter 6: The Router’s Web-based Utility”).

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Contents Dual-Band Wireless A+B Broadband Router Copyright & Trademarks Table of Contents Common Problems and Solutions Frequently Asked Questions IntroductionEnvironmental 127 IP Addresses FeaturesRouter’s Functions What’s an IP Address?Dhcp Dynamic Host Configuration Protocol Servers Router Setup OverviewDynamic IP Addresses Getting to Know the Dual-Band Wireless A+B Broadband Router Router’s Back PanelRouter’s Front Panel LEDs LAN Indicators Internet IndicatorsProceed to Connect the Router Wired Connection to a PC Connect the RouterOverview Configure the PCs Wireless Connection to a PCConfiguring Windows 98 and Millennium PCs Go to Configure the Router’s Basic SettingsConfiguring Windows 2000 PCs Configuring Windows XP PCs Configure the Router’s Basic Settings Static or Fixed IP Address Automatic Configuration DhcpEnter the Default Gateway Enter the Internet IP AddressHow to Access the Web-based Utility Router’s Web-based UtilityAutomatic Configuration Dhcp SetupStatic IP Pptp 5GHz, 802.11a 5GHz, 802.11a WEP 4GHz, 802.11b WEP Password StatusLAN Dhcp Log HelpAdvanced Tabs Advanced Wireless 5GHz, 802.11a802.1x Configuration Radius Server Filters Private MAC Filter To set up a filter Private IP Filter11-20 , 21-30 , 31-40 , or 41-50 from Applications External Port TCP Protocol UDP Protocol Port ForwardingRouting Click the Delete This Entry buttonDMZ Host MAC Address Clone Need to set a static IP address on a PC Appendix a TroubleshootingCommon Problems and Solutions For Windows NTFor Windows XP Want to test my Internet connectionFor Windows 98, Me, 2000, and XP Need to set up a server behind my Router TCP UDPCan’t get the Internet game, server, or application to work Firmware upgrade failed, and/or the Diag LED is flashing To start over, I need to set the Router to factory defaultNeed to upgrade the firmware My DSL service’s PPPoE is always disconnectingFrequently Asked Questions Click the Advanced = Filters tabDoes the Router support ICQ send file? How can I block corrupted FTP downloads?What is the Ieee 802.11a standard? What is DMZ Hosting?What are the advanced features of the Router? What is the Ieee 802.11b standard?What is infrastructure mode? What Ieee 802.11b features are supported?What is ad-hoc mode? What is roaming?How do I reset the Router? What is WEP?What is a MAC Address? How do I resolve issues with signal loss?Appendix B How to Ping Your ISP’s E-mail & Web Addresses Step One Pinging an IP AddressAppendix C Configuring Wireless Security Step Two Pinging for a Web AddressBackground 802.1x Authentication WEP EncryptionMD5 Authentication for Windows XP Figure C-2Figure C-5 Digital Certificate Installation Figure C-9Click Install this certificate Figure C-13TLS Authentication for Windows XP Figure C-18Figure C-21 Figure C-25 For Windows 95, 98, and MeFigure D-3 For Windows NT, 2000, and XPAppendix E Glossary 111 113 115 117 119 121 123 125 Category 5 Ethernet Network Cable or better Appendix F SpecificationsOne 10/100 RJ-45 Port for Cable/DSL Modem EnvironmentalAppendix H Contact Information Appendix G Warranty InformationSales Information Technical Support RMA Issues Fax Web site FTP siteCopyright 2002 Linksys, All Rights Reserved
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