Preface

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This preface discusses the audience, organization, and conventions used in this guide. It also provides information on how to access other Cisco documentation that is available on the Cisco website, and how to order the Cisco Documentation CD-ROM.

Audience

This guide is intended for network administrators whose backgrounds vary from having no or little experience configuring routers to having a high level of experience. This guide is useful for both the following situations:

•You have configured the software using the Cisco Router Web Setup application, the web-based configuration tool, and want to configure additional advanced software features using the command-line interface (CLI).

•You want to configure the software using only the CLI.

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Note Cisco recommends that inexperienced network administrators use the Cisco Router Web Setup application to configure their routers.

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See the "Organization" section to find out which chapter contains the information you need to configure your software.

Organization

This guide is organized as follows:

•Chapter 1, "Concepts"—Provides general concept explanations of the features in the Cisco 806 router.

•Chapter 2, "Network Scenarios"—Describes a number of Internet access scenarios, with their specific network topologies and configurations.

•Chapter 3, "Feature-by-Feature Router Configuration"—Explains the Cisco 806 router configuration, feature by feature.

•Chapter 4, "Troubleshooting"—Provides information on identifying and solving problems with the Ethernet interfaces. Also explains how to recover a lost software password.

•Appendix A, "Cisco IOS Basic Skills"—Explains what you need to know about the Cisco IOS software before you begin to configure it.

•Appendix B, "ROM Monitor"—Explains how to use the ROM Monitor bootstrap program to reinitialize the Cisco 806 hardware and perform configuration tasks.

•Appendix C, "Common Port Assignments"—Describes the currently assigned Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) port numbers.

Conventions

This section describes the conventions used in this guide.

•The carat character (^) represents the Control key.

For example, the key combinations ^D and Ctrl-D are equivalent. Both mean to hold down the Control key while pressing the D key. Keys are indicated in capitals, but are not case sensitive.

Command descriptions use these conventions:

•Commands and keywords are in boldface.

•Variables for which you supply values are in italic.

–Elements in square brackets ([]) are optional.

–Alternative but required keywords are grouped in braces ({}) and separated by vertical bars (|).

•Examples use these conventions:

–Terminal sessions and console screen display examples are in screen font.

–Information you enter is in boldface screen font.

–Nonprinting characters, such as passwords, are in angle brackets (<>).

–Default responses to system prompts are in square brackets ([]).

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Note Means reader take note. Notes contain helpful suggestions or references to additional information and material.

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Timesaver This symbol means that the described action saves time.

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Caution This symbol means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data.

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Related Documents

The following publications provide related information on this product:

•Cisco 806 Router Cabling and Setup Quick Start Guide is a guide to quickly cabling and setting up the Cisco 806 router.

•Cisco 806 Router Hardware Installation Guide is the detailed guide for installing the Cisco 806 router.

•Cisco Router Web Setup User Guide explains how to use the Cisco Router Web Setup application.

•Release Notes for the Cisco 806 Router contains the latest information about the Cisco 806 router.

•The latest version of the Cisco IOS Release Notes contains information about the Cisco IOS images available for the Cisco 806 router.

•Regulatory Compliance and Safety Information for the Cisco 806 Router provides regulatory compliance and safety information for the Cisco 806 router.

Obtaining Documentation

The following sections provide sources for obtaining documentation from Cisco Systems.

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at the following sites:

•http://www.cisco.com

•http://www-china.cisco.com

•http://www-europe.cisco.com

Documentation CD-ROM

Cisco documentation and additional literature are available in a CD-ROM package. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.

Ordering Documentation

Cisco documentation is available in the following ways:

•Registered Cisco Direct Customers can order Cisco Product documentation from the Networking Products MarketPlace:

http://www.cisco.com/cgi-bin/order/order_root.pl

•Registered Cisco.com users can order the Documentation CD-ROM through the online Subscription Store:

http://www.cisco.com/go/subscription

•Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco corporate headquarters (California, USA) at 408 526-7208 or, in North America, by calling 800 553-NETS(6387).

Documentation Feedback

If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.

You can e-mail your comments to bug-doc@cisco.com.

To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address:

Attn Document Resource Connection
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-9883

We appreciate your comments.

Obtaining Technical Assistance

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC website.

Cisco.com

Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.

Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.

Customers and partners can self-register on Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco.

To access Cisco.com, go to the following website:

http://www.cisco.com

Technical Assistance Center

The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.

Contacting TAC by Using the Cisco TAC Website

If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website:

http://www.cisco.com/tac

P3 and P4 level problems are defined as follows:

•P3—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.

•P4—You need information or assistance on Cisco product capabilities, product installation, or basic product configuration.

In each of the above cases, use the Cisco TAC website to quickly find answers to your questions.

To register for Cisco.com, go to the following website:

http://www.cisco.com/register/

If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website:

http://www.cisco.com/tac/caseopen

Contacting TAC by Telephone

If you have a priority level 1 (P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following website:

http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml

P1 and P2 level problems are defined as follows:

•P1—Your production network is down, causing a critical impact to business operations if service is not restored quickly. No workaround is available.

•P2—Your production network is severely degraded, affecting significant aspects of your business operations. No workaround is available.