Linksys WRT51AB manual Need to set up a server behind my Router, Tcp Udp

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Instant Wireless® Series

D.Make sure you have the right cable. Check to see if the Internet column has a solidly lit Link/Act LED.

E.Make sure the cable connecting from your cable or DSL modem is con- nected to the Router’s Internet port. Verify that the Status page of the Router’s web-based utility shows a valid IP address from your ISP.

F.Turn off the computer, Router, and cable/DSL modem. Wait 30 seconds, and then turn on the Router, cable/DSL modem, and computer. Check the Status tab of the Router’s web-based utility to see if you get an IP address.

4. I am not able to access the Setup page of the Router’s web-based utility.

A.Refer to “Problem #2, I want to test my Internet connection” to verify that your computer is properly connected to the Router.

B.Refer to “Appendix D: Finding the MAC Address and IP address for Your Ethernet Adapter” to verify that your computer has an IP Address, Subnet Mask, Gateway, and DNS.

C.Set a static IP address on your system; refer to “Problem #1: I need to set a static IP address.”

D.Refer to “Problem #10: I need to remove the proxy settings or the dial-up pop-up window (for PPPoE users).”

5.I can’t get my Virtual Private Network (VPN) working through the Router.

Access the Router’s web interface by going to http://192.168.1.1 or the IP address of the Router, and go to the Advanced => Filters tab. Make sure you have IPsec pass-through and/or PPTP pass-through enabled.

VPNs that use IPSec with the ESP (Encapsulation Security Payload known as protocol 50) authentication will work fine. At least one IPSec session will work through the Router; however, simultaneous IPSec sessions may be possible, depending on the specifics of your VPNs.

VPNs that use IPSec and AH (Authentication Header known as protocol 51) are incompatible with the Router. AH has limitations due to occasional incom- patibility with the NAT standard.

Change the IP address for the Router to another subnet to avoid a conflict between the VPN IP address and your local IP address. For example, if your VPN server assigns an IP address 192.168.1.X (X is a number from 1 to 254) and your local LAN IP address is 192.168.1.X (X is the same number used in the VPN IP address), the Router will have difficulties routing information to the right location. If you change the Router’s IP address to 192.168.2.1, that should solve the problem. Change the Router’s IP address through the Setup tab

Dual-Band Wireless A+B Broadband Router

of the web interface. If you assigned a static IP address to any computer or net- work device on the network, you need to change its IP address accordingly to 192.168.2.Y (Y being any number from 1 to 254). Note that each IP address must be unique within the network.

Your VPN may require port 500/UDP packets to be passed to the computer that is connecting to the IPSec server. Refer to “Problem #7, I need to set up online game hosting or use other Internet applications” for details.

Check the Linksys website for more information at www.linksys.com.

6. I need to set up a server behind my Router.

To use a server like a web, ftp, or mail server, you need to know the respective port numbers they are using. For example, port 80 (HTTP) is used for web; port 21 (FTP) is used for FTP, and port 25 (SMTP outgoing) and port 110 (POP3 incoming) are used for the mail server. You can get more information by viewing the documentation provided with the server you installed. Follow these steps to set up port forwarding through the Router’s web-based utility. We will be setting up web, ftp, and mail servers.

A.Access the Router’s web-based utility by going to http://192.168.1.1 or the IP address of the Router. Go to the Advanced => Port Forwarding tab.

B.Enter any name you want to use for the Customized Application.

C.Enter the External Port range of the service you are using. For example, if you have a web server, you would enter the range 80 to 80.

D.Check the protocol you will be using, TCP and/or UDP.

E.Enter the IP address of the PC or network device that you want the port server to go to. For example, if the web server’s Ethernet adapter IP address is 192.168.1.100, you would enter 100 in the field provided. Check “Appendix D: Finding the MAC Address and IP Address for Your Ethernet Adapter” for details on getting an IP address.

F.Check the Enable option for the port services you want to use. Consider the example below:

Customized

External Port

TCP

UDP

IP Address

Enable

Application

 

 

 

 

 

Web server

80 to 80

X

X

192.168.1.100

X

FTP server

21 to 21

X

 

192.168.1.101

X

SMTP (outgoing)

25 to 25

X

X

192.168.1.102

X

POP3 (incoming)

110 to 110

X

X

192.168.1.102

X

When you have completed the configuration, click the Apply 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 What’s an IP Address? FeaturesRouter’s Functions IP AddressesDhcp 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 Internet IP Address Automatic Configuration DhcpEnter the Default Gateway Static or Fixed 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 For Windows NT Appendix a TroubleshootingCommon Problems and Solutions Need to set a static IP address on a PCFor 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 My DSL service’s PPPoE is always disconnecting To start over, I need to set the Router to factory defaultNeed to upgrade the firmware Firmware upgrade failed, and/or the Diag LED is flashingClick the Advanced = Filters tab Frequently Asked QuestionsHow can I block corrupted FTP downloads? Does the Router support ICQ send file?What is the Ieee 802.11b standard? What is DMZ Hosting?What are the advanced features of the Router? What is the Ieee 802.11a standard?What is roaming? What Ieee 802.11b features are supported?What is ad-hoc mode? What is infrastructure mode?How do I resolve issues with signal loss? What is WEP?What is a MAC Address? How do I reset the Router?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 Environmental Appendix F SpecificationsOne 10/100 RJ-45 Port for Cable/DSL Modem Category 5 Ethernet Network Cable or betterWeb site FTP site Appendix G Warranty InformationSales Information Technical Support RMA Issues Fax Appendix H Contact InformationCopyright 2002 Linksys, All Rights Reserved
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