Linksys WRT51AB manual Applications External Port TCP Protocol UDP Protocol, Port Forwarding

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Instant Wireless® Series

Port Forwarding

The Port Forwarding screen sets up public services on your network, such as web servers, ftp servers, e-mail servers, or other specialized Internet applica- tions. (Specialized Internet applications are any applications that use Internet access to perform functions such as videoconferencing or online gaming. Some Internet applications may not require any forwarding.)

Figure 6-24

Note: Any PC whose port is being forwarded should have its DHCP client function disabled and a new static IP address assigned to it because its IP address may change when using the DHCP function.

Customized Applications In the field provided, enter the name you wish to give each application.

External Port For each application, enter the number of the External Ports (the port numbers seen by users on the Internet) in the appropriate fields. (To find out the port range, check your application’s documentation.) If there is only one External Port, enter its number in both External Port fields.

Dual-Band Wireless A+B Broadband Router

TCP Protocol Click this checkbox if you want to forward the data transmis- sions that use the TCP protocol.

UDP Protocol Click this checkbox if you want to forward the data transmis- sions that use the UDP protocol.

IP Address For each application, enter the IP Address of the PC running the specific application.

Enable Click the Enable checkbox to enable port forwarding for the relevant application.

The following table shows the typical port forwarding settings for common Internet applications.

Applications	External Port	TCP Protocol	UDP Protocol

FTP	21

Telnet	23

SMTP	25	÷

DNS	53		÷

TFTP	69

Finger	79

HTTP	80

POP3	110

NNTP	119	÷

SNMP	161		÷

To apply any of the settings you change on this page, click the Apply button. To cancel any changes you’ve entered on this page, click the Cancel button. To get more information about the features, click the Help button.

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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 Router’s Functions FeaturesIP Addresses 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 Wireless Connection to a PC Configure the PCsGo to Configure the Router’s Basic Settings Configuring Windows 98 and Millennium PCsConfiguring Windows 2000 PCs Configuring Windows XP PCs Configure the Router’s Basic Settings Enter the Default Gateway Automatic Configuration DhcpStatic or Fixed IP Address Enter the Internet IP AddressRouter’s Web-based Utility How to Access the Web-based UtilitySetup Automatic Configuration DhcpStatic IP Pptp 5GHz, 802.11a 5GHz, 802.11a WEP 4GHz, 802.11b WEP Status PasswordLAN Dhcp Help LogAdvanced Tabs 5GHz, 802.11a Advanced Wireless802.1x Configuration Radius Server Filters Private MAC Filter To set up a filter Private IP Filter11-20 , 21-30 , 31-40 , or 41-50 from Port Forwarding Applications External Port TCP Protocol UDP ProtocolClick the Delete This Entry button RoutingDMZ Host MAC Address Clone Common Problems and Solutions Appendix a TroubleshootingNeed to set a static IP address on a PC For Windows NTFor Windows XP Want to test my Internet connectionFor Windows 98, Me, 2000, and XP TCP UDP Need to set up a server behind my RouterCan’t get the Internet game, server, or application to work Need to upgrade the firmware To start over, I need to set the Router to factory defaultFirmware upgrade failed, and/or the Diag LED is flashing My DSL service’s PPPoE is always disconnectingClick the Advanced = Filters tab Frequently Asked QuestionsHow can I block corrupted FTP downloads? Does the Router support ICQ send file?What are the advanced features of the Router? What is DMZ Hosting?What is the Ieee 802.11a standard? What is the Ieee 802.11b standard?What is ad-hoc mode? What Ieee 802.11b features are supported?What is infrastructure mode? What is roaming?What is a MAC Address? What is WEP?How do I reset the Router? How do I resolve issues with signal loss?Step One Pinging an IP Address Appendix B How to Ping Your ISP’s E-mail & Web AddressesAppendix C Configuring Wireless Security Step Two Pinging for a Web AddressBackground WEP Encryption 802.1x AuthenticationFigure C-2 MD5 Authentication for Windows XPFigure C-5 Figure C-9 Digital Certificate InstallationFigure C-13 Click Install this certificateFigure C-18 TLS Authentication for Windows XPFigure C-21 For Windows 95, 98, and Me Figure C-25For Windows NT, 2000, and XP Figure D-3Appendix E Glossary 111 113 115 117 119 121 123 125 One 10/100 RJ-45 Port for Cable/DSL Modem Appendix F SpecificationsCategory 5 Ethernet Network Cable or better EnvironmentalSales Information Technical Support RMA Issues Fax Appendix G Warranty InformationAppendix H Contact Information Web site FTP siteCopyright 2002 Linksys, All Rights Reserved