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Linksys RT41-BU User Manual

Wired broadband router
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®
A Division of Cisco Systems, Inc.
Wired Broadband Router

User Guide

RT41-BU
Model No.

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Summary of Contents for Linksys RT41-BU

  • Page 1: User Guide

    ® A Division of Cisco Systems, Inc. Wired Broadband Router User Guide RT41-BU Model No.
  • Page 2 Wired Broadband Router Copyright and Trademarks Specifications are subject to change without notice. Linksys is a registered trademark or trademark of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other countries. Copyright © 2005 Cisco Systems, Inc. All rights reserved.

  • Page 3: Table Of Contents

    Wired Broadband Router Table of Contents Chapter 1: Introduction Welcome What’s in this Guide? Chapter 2: Networking Basics An Introduction to Local Area Networks The Use of IP Addresses Chapter 3: Getting to Know the Router The Back Panel The Front Panel Chapter 4: Connecting the Router Overview Connecting the Router to Your Broadband Modem...
  • Page 4 Wired Broadband Router The Status Tab - Router The Status Tab - Local Network Appendix A: Troubleshooting Common Problems and Solutions Frequently Asked Questions Appendix B: Finding the MAC Address and IP Address for Your Ethernet Adapter 49 Windows 98 or Me Instructions Windows 2000 or XP Instructions For the Router’s Web-based Utility Appendix C: Windows Help...
  • Page 5 Wired Broadband Router List of Figures Figure 3-1: Back Panel Figure 3-2: Front Panel Figure 4-1: Connect the Broadband Modem Figure 4-2: Connect a PC Figure 4-3: Connect the Power Figure 5-1: Router’s IP Address Figure 5-2: Router Login Figure 5-3: Setup Tab - Basic Setup(Automatic Configuration - DHCP) Figure 5-4: Static IP Figure 5-5: PPPoE Figure 5-6: PPTP...
  • Page 6 Wired Broadband Router Figure 5-24: Ping Test Figure 5-25: Traceroute Test Figure 5-26: Administration Tab - Factory Defaults Figure 5-27: Administration Tab - Firmware Upgrade Figure 5-28: Administration Tab - Backup and Restore Figure 5-29: Administration Tab - Reboot Figure 5-30: Status Tab - Router Figure 5-31: Status Tab - Local Network Figure 5-32: DHCP Clients Table Figure B-1: IP Configuration Screen...

  • Page 7: Chapter 1: Introduction

    “wired”. ethernet: an IEEE standard network protocol To create your network, install and set up the Router. To guide you through the process, Linksys strongly that specifies how data is placed on and recommends that you run the Setup Wizard on the Setup CD-ROM. If you prefer to manually set up the Router, use retrieved from a common transmission the instructions in this User Guide to help you.

  • Page 8: What's In This Guide

    Wired Broadband Router What’s in this Guide? This user guide covers the basic steps for setting up a network with a router. After going through “Chapter 3: Getting to Know the Router,” most users will only need to use the following chapters: •...
  • Page 9 • Appendix G: Regulatory Information This appendix supplies the regulatory information regarding the Router. • Appendix H: Contact Information This appendix provides contact information for a variety of Linksys resources, including Technical Support. Chapter 1: Introduction What’s in this Guide?

  • Page 10: Chapter 2: Networking Basics

    Wired Broadband Router Chapter 2: Networking Basics An Introduction to Local Area Networks Simply put, a router is a network device that connects two networks together. The Router connects your local area network (LAN), or the group of PCs in your home or office, to the Internet. The Router processes and regulates the data that travels between these two networks.
  • Page 11 Wired Broadband Router A DHCP server can either be a designated PC on the network or another network device, such as the Router. By default, the Router’s Internet Connection Type is Obtain an IP automatically (DHCP). 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.

  • Page 12: Chapter 3: Getting To Know The Router

    Wired Broadband Router Chapter 3: Getting to Know the Router The Back Panel The Router’s ports and the Reset button are located on the back panel of the Router. Figure 3-1: Back Panel Internet This Internet port connects to your cable or DSL modem. Ethernet 1-4 These four Ethernet ports connect to network devices, such as PCs, print servers, or additional switches.

  • Page 13: The Front Panel

    Wired Broadband Router The Front Panel The Router’s LEDs, which inform you about network activities, are located on the front panel. Figure 3-2: Front Panel Power Green. The Power LED lights up when the Router is powered on. If the LED is flashing, the Router is booting up or running a system self-test.

  • Page 14: Chapter 4: Connecting The Router

    Wired Broadband Router Chapter 4: Connecting the Router Overview This chapter provides instructions to connect the Router to your Broadband Modem. Connecting the Router to Your Broadband Modem 1. Make sure that all of your hardware is powered off, including the Router, PCs, and broadband modem. 2.

  • Page 15: Chapter 5: Configuring The Router

    Chapter 5: Configuring the Router Overview Linksys recommends using the Setup CD-ROM for first-time installation of the Router. If you do not wish to run the Setup Wizard on the Setup CD-ROM, then you can use the Web-based Utility to configure the Router. For advanced users, you may configure the Router’s advanced settings through the Web-based Utility.
  • Page 16 Wired Broadband Router Access Restrictions Internet Access. This screen allows you to permit or block specific kinds of Internet usage and traffic. Applications & Gaming • Port Range Forward. Set up public services or other specialized Internet applications on your network. •...

  • Page 17: How To Access The Web-Based Utility

    Wired Broadband Router How to Access the Web-based Utility To access the Web-based Utility of the Router, launch Internet Explorer or Netscape Navigator, and enter the Router’s default IP address, 192.168.15.1, in the Address field. Press the Enter key. Figure 5-1: Router’s IP Address A screen will appear asking you for your User Name and Password.

  • Page 18: Figure 5-4: Static Ip

    Wired Broadband Router Static IP If you are required to use a permanent IP address, then select Static IP. Internet IP Address. This is the IP address that the Router has, when seen from the Internet. Your ISP will provide you with the IP Address you need to specify here. Subnet Mask.

  • Page 19: Figure 5-6: Pptp

    Wired Broadband Router PPTP Point-to-Point Tunneling Protocol (PPTP) is a service that applies to connections in Europe and Israel only. Internet IP Address. This is the IP address that the Router has, when seen from the Internet. Your ISP will provide you with the IP Address you need to specify here.
  • Page 20 Wired Broadband Router desired. It is recommended that you leave this value in the 1200 to 1500 range. For most DSL users, it is recommended to use the value 1492. By default, MTU is set at 1500 when disabled. Internet Port Speed. You can specify the transmission speed of the Router’s Internet port if your broadband modem requires a specific speed setting.
  • Page 21 Wired Broadband Router Static DNS 1-2. The Domain Name System (DNS) is how the Internet translates domain or website names into Internet addresses or URLs. Your ISP will provide you with at least one DNS Server IP Address. You can enter up to two DNS Server IP Addresses here.

  • Page 22: The Setup Tab - Ddns

    Wired Broadband Router The Setup Tab - DDNS The Router offers a Dynamic Domain Name System (DDNS) feature. DDNS lets you assign a fixed host and domain name to a dynamic Internet IP address. It is useful when you are hosting your own website, FTP server, or other server behind the Router.

  • Page 23: The Setup Tab - Mac Address Clone

    Wired Broadband Router The Setup Tab - MAC Address Clone A MAC address is a 12-digit code assigned to a unique piece of hardware for identification, like a social security number. Some ISPs will require you to register a MAC address in order to access the Internet. If you do not wish to re-register the MAC address with your ISP, you may assign the MAC address currently registered with your ISP to the Router using the MAC Address Clone feature.

  • Page 24: The Security Tab - Firewall

    Wired Broadband Router The Security Tab - Firewall When you click the Security tab, you will see the Firewall screen. The Router’s firewall enhances the security of your network. You can also enable a variety of filters to further protect your network and block anonymous Internet requests.

  • Page 25: The Security Tab - Vpn

    Wired Broadband Router The Security Tab - VPN The VPN screen allows you to allow VPN tunnels using IPSec, PPTP, or L2TP protocols to pass through the Router. VPN Passthrough IPSec Passthrough. IPSec (Internet Protocol Security) is a suite of protocols used to implement secure exchange of packets at the IP layer.

  • Page 26: The Access Restrictions Tab - Internet Access

    Wired Broadband Router The Access Restrictions Tab - Internet Access The Internet Access screen allows you to block or allow specific kinds of Internet usage and traffic, such as Internet access, designated services, and websites during specific days and times. Internet Access Internet Access Policy.

  • Page 27: Figure 5-14: List Of Pcs

    Wired Broadband Router 4. Click the Edit List of PCs button to select which PCs will be affected by the policy. The List of PCs screen will appear. You can select a PC by MAC Address or IP Address. You can also enter a range of IP Addresses if you want this policy to affect a group of PCs.

  • Page 28: The Applications & Gaming Tab - Port Range Forward

    Wired Broadband Router The Applications & Gaming Tab - Port Range Forward When you click the Applications & Gaming tab, you will see the Port Range Forward screen. Port range forwarding sets up public services on your network, such as web servers, ftp servers, e-mail servers, or other specialized Internet applications.

  • Page 29: The Applications & Gaming Tab - Port Trigger

    Wired Broadband Router The Applications & Gaming Tab - Port Trigger The Port Trigger screen allows the Router to watch outgoing data for specific port numbers. The IP address of the computer that sends the matching data is remembered by the Router, so that when the requested data returns through the Router, the data is pulled back to the proper computer by way of IP address and port mapping rules.

  • Page 30: The Applications & Gaming Tab - Upnp Forward

    Wired Broadband Router The Applications & Gaming Tab - UPnP Forward The UPnP Forward screen displays preset application settings as well as options to customize port services for other applications. UPnP Forward Application. Ten applications are preset. For custom applications, enter the name of your application in one of the available fields.
  • Page 31 Wired Broadband Router NNTP (Network News Transfer Protocol). The protocol used to connect to Usenet groups on the Internet. Usenet newsreaders support the NNTP protocol. SNMP (Simple Network Management Protocol). A widely used network monitoring and control protocol. Data is passed from SNMP agents, which are hardware and/or software processes reporting activity in each network device (hub, router, bridge, etc.) to the workstation console used to oversee the network.

  • Page 32: The Applications & Gaming Tab - Dmz

    Wired Broadband Router The Applications & Gaming Tab - DMZ The DMZ screen allows one local user to be exposed to the Internet for use of a special-purpose service such as Internet gaming and videoconferencing. DMZ hosting forwards all the ports at the same time to one PC. Port Range Forwarding is more secure because it only opens the ports you want to have opened, while DMZ hosting opens all the ports of one computer, exposing the computer to the Internet.

  • Page 33: The Administration Tab - Management

    Wired Broadband Router The Administration Tab - Management When you click the Administration tab, you will see the Management screen. This screen allows you to change the Router’s access settings as well as configure the SNMP (Simple Network Management Protocol) and UPnP (Universal Plug and Play) features.
  • Page 34 Wired Broadband Router Set Community. Enter the password that allows read/write access to the Router’s SNMP information.The default name is private. A name must be entered in this field. SNMP Trap Community. Enter the password required by the remote host computer that will receive trap messages or notices sent by the Router.

  • Page 35: The Administration Tab - Log

    Log Viewer IP Address. For a permanent record of these logs, Logviewer software must be used. This software is downloadable from the Linksys website, www.linksys.com. The Logviewer saves all incoming and outgoing activity in a permanent file on your PC’s hard drive. In the Log Viewer IP Address field, enter the fixed IP address of the PC running the Logviewer software.

  • Page 36: The Administration Tab - Diagnostics

    Wired Broadband Router The Administration Tab - Diagnostics The diagnostic tests (Ping and Traceroute) allow you to check the connections of your network components. Ping Test. The Ping test will check the status of a connection. Click the Ping button to open the Ping Test screen. Enter the IP address or domain name of the PC whose connection you wish to test and how many times you wish to test it, 5, 10, or unlimited.

  • Page 37: The Administration Tab - Factory Defaults

    Wired Broadband Router The Administration Tab - Factory Defaults The Factory Defaults screen allows you to restore the Router’s configuration to its factory default settings. Factory Defaults Restore Factory Defaults. To clear all of the Router’s settings and reset them to its factory defaults, click the Yes radio button.

  • Page 38: The Administration Tab - Firmware Upgrade

    The Firmware Upgrade screen allows you to upgrade the Router’s firmware. Do not upgrade the firmware unless you are experiencing problems with the Router or the new firmware has a feature you want to use. Before upgrading the firmware, download the Router’s firmware upgrade file from the Linksys website, www.linksys.com. Then extract the file.

  • Page 39: The Administration Tab - Backup And Restore

    Wired Broadband Router The Administration Tab - Backup and Restore The Backup and Restore screen allows you to back up and restore the Router’s configuration. Backup and Restore Please select a file to restore. In the field provided, enter the name of the configuration file you want to restore, or click the Browse button to find this file.

  • Page 40: The Status Tab - Router

    Wired Broadband Router The Status Tab - Router The Router screen displays information about the Router and its current settings. Router Information Current Firmware Version. This shows the version and date of the firmware that is currently installed. Previous Firmware Version. This shows the version and date of the firmware that was previously installed. Current Time.

  • Page 41: The Status Tab - Local Network

    Wired Broadband Router The Status Tab - Local Network The Local Network screen displays information about the local network. Local Network MAC Address. The MAC Address of the Router’s LAN (local area network) interface is displayed here. IP Address. The Router’s local IP Address is shown here. Subnet Mask.

  • Page 42: Appendix A: Troubleshooting

    Appendix A: Troubleshooting This appendix provides solutions to problems that may occur during the installation and operation of the Router. Read the description below to solve your problems. If you can't find an answer here, check the Linksys website at www.linksys.com.
  • Page 43 Wired Broadband Router E. Click the DNS tab, and make sure the DNS Enabled option is selected. Enter the Host and Domain names (e.g., John for Host and home for Domain). Enter the DNS entry provided by your ISP. If your ISP has not provided the DNS IP address, contact your ISP to get that information or go to its website for the information.
  • Page 44 Wired Broadband Router E. Enter a unique IP address that is not used by any other computer on the network connected to the Router. You can only use an IP address in the ranges 192.168.15.2 to 192.168.15.99 and 192.168.15.151 to 192.168.15.254.
  • Page 45 E. In the command prompt, type ping www.linksys.com and press the Enter key. • If you get a reply, the computer is connected to the Internet. If you cannot open a webpage, try the ping command from a different computer to verify that your original computer is not the cause of the problem.
  • Page 46 Your VPN may require port 500/UDP packets to be passed to the computer that is connecting to the IPSec server. Refer to “Problem #10, I need to set up online game hosting or use other Internet applications” for details. Check the Linksys website at www.linksys.com for more information. Appendix A: Troubleshooting...
  • Page 47 Wired Broadband Router 7. 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.
  • Page 48 Wired Broadband Router A. Access the Router’s Web-based Utility by going to http://192.168.15.1 or the IP address of the Router. Go to the Applications & Gaming => Port Range Forward tab. B. Enter any name you want to use for the Application. C.
  • Page 49 Wired Broadband Router D. Enter the Ethernet adapter’s IP address of the computer you want exposed to the Internet. This will bypass the NAT security for that computer. Please refer to “Appendix C: Finding the MAC Address and IP Address for Your Ethernet Adapter” for details on getting an IP address. Once completed with the configuration, click the Save Settings button.
  • Page 50 Wired Broadband Router 13. My DSL service’s PPPoE is always disconnecting. PPPoE is not actually a dedicated or always-on connection. The DSL ISP can disconnect the service after a period of inactivity, just like a normal phone dial-up connection to the Internet. There is a setup option to “keep alive”...

  • Page 51: Frequently Asked Questions

    Wired Broadband Router B. Enter the password, if asked. (The default password is admin.) C. Click the Applications & Gaming => Port Trigger tab. D. Enter any name you want to use for the Application Name. E. Enter the Start and End Ports of the Triggered Port Range. Check with your Internet application provider for more information on which outgoing port services it is using.
  • Page 52 ISP. Does the Router support any operating system other than Windows 98, Millennium, 2000, or XP? Yes, but Linksys does not, at this time, provide technical support for setup, configuration or troubleshooting of any non-Windows operating systems.
  • Page 53 Ethernet adapter as a temporary measure. (Please look at the Network Control Panel in your Ethernet adapter’s Advanced Properties tab.) Make sure that your proxy setting is disabled in the browser. Check our website at www.linksys.com for more information. If all else fails in the installation, what can I do? Reset the Router by holding down the Reset button for thirty seconds.
  • Page 54 Under the Applications & Gaming => Port Range Forward tab, set port forwarding to 113 for the PC on which you are using mIRC. If your questions are not addressed here, refer to the Linksys website, www.linksys.com. Appendix A: Troubleshooting...

  • Page 55: Appendix B: Finding The Mac Address And Ip Address For Your Ethernet Adapter

    Wired Broadband Router Appendix B: Finding the MAC Address and IP Address for Your Ethernet Adapter This section describes how to find the MAC address for your computer’s Ethernet adapter so you can use the MAC filtering and/or MAC address cloning feature of the Router. You can also find the IP address of your computer’s Ethernet adapter.

  • Page 56: For The Router's Web-Based Utility

    Wired Broadband Router 3. Write down the Physical Address as shown on your computer screen; it is the MAC address for your Ethernet adapter. This appears as a series of numbers and letters. The MAC address/Physical Address is what you will use for MAC address cloning or MAC filtering. NOTE: The MAC address is also called the Physical Address.

  • Page 57: Appendix C: Windows Help

    Wired Broadband Router Appendix C: Windows Help Almost all networking products require Microsoft Windows. Windows is the most used operating system in the world and comes with many features that help make networking easier. These features can be accessed through Windows Help and are described in this appendix.

  • Page 58: Appendix D: Glossary

    Wired Broadband Router Appendix D: Glossary Adapter - A device that adds network functionality to your PC. Backbone - The part of a network that connects most of the systems and networks together, and handles the most data. Bandwidth - The transmission capacity of a given device or network. Beacon Interval - Data transmitted on your wireless network that keeps the network synchronized.
  • Page 59 Wired Broadband Router Default Gateway - A device that forwards Internet traffic from your local area network. DHCP (Dynamic Host Configuration Protocol) - A networking protocol that allows administrators to assign temporary IP addresses to network computers by “leasing” an IP address to a user for a limited amount of time, instead of assigning permanent IP addresses.
  • Page 60 Wired Broadband Router Half Duplex - Data transmission that can occur in two directions over a single line, but only one direction at a time. Hardware - The physical aspect of computers, telecommunications, and other information technology devices. HTTP (HyperText Transport Protocol) - The communications protocol used to connect to servers on the World Wide Web.
  • Page 61 Wired Broadband Router Ping (Packet INternet Groper) - An Internet utility used to determine whether a particular IP address is online. POP3 (Post Office Protocol 3) - A standard mail server commonly used on the Internet. Port - The connection point on a computer or networking device used for plugging in cables or adapters. Power over Ethernet (PoE) - A technology enabling an Ethernet network cable to deliver both data and power.
  • Page 62 Wired Broadband Router Switch - 1. A data switch that connects computing devices to host computers, allowing a large number of devices to share a limited number of ports. 2. A device for making, breaking, or changing the connections in an electrical circuit.

  • Page 63: Appendix E: Specifications

    Wired Broadband Router Appendix E: Specifications Model RT41-BU Standards IEEE 802.3 (10BaseT), IEEE 802.3u (100BaseTX) Ports/Buttons One 10/100 RJ-45 Port for Broadband Modem, Four 10/100 RJ-45 Switched Ports, One Power Port, One Reset Button Cabling Type RJ-45 Ethernet Category 5...

  • Page 64: Appendix F: Warranty Information

    Your exclusive remedy and Linksys' entire liability under this warranty will be for Linksys at its option to repair or replace the Product or refund Your purchase price less any rebates.

  • Page 65: Appendix G: Regulatory Information

    Wired Broadband Router Appendix G: Regulatory Information FCC STATEMENT This product has been tested and complies with the specifications for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
  • Page 66 Equipment (WEEE) This document contains important information for users with regards to the proper disposal and recycling of Linksys products. Consumers are required to comply with this notice for all electronic products bearing the following symbol: Appendix G: Regulatory Information...
  • Page 67 Wired Broadband Router Appendix G: Regulatory Information...
  • Page 68 Wired Broadband Router Appendix G: Regulatory Information...
  • Page 69 Wired Broadband Router Appendix G: Regulatory Information...
  • Page 70 Wired Broadband Router For more information, visit www.linksys.com. Appendix G: Regulatory Information...

  • Page 71: Appendix H: Contact Information

    Can't find information about a product you want to buy on the web? Do you want to know more about networking with Linksys products? Give our advice line a call at: 800-546-5797 (LINKSYS) Or fax your request in to:...

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