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11
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Preface
This software configuration guide provides instructions for using the Cisco command-line interface
(CLI) to configure features of the following Cisco 800 series routers:
•
Cisco 850 Series Routers
–
Cisco 851 Ethernet Access Router
–
Cisco 857 DSL Access Router
•
Cisco 870 Series Routers
–
Cisco 871 Ethernet Access Router
–
Cisco 876, Cisco 877, and Cisco 878 DSL Access Routers
This preface describes the intended audience, the organization of this guide, and the text and command
conventions used throughout the guide. The preface includes the following topics:
•
Audience
•
Organization
•
Conventions
•
Related Documents
•
Obtaining Documentation and Submitting a Service Request
Audience
This guide is intended for network administrators whose backgrounds vary from having no or little
experience in configuring routers to having a high level of experience. You can use this guide in the
following situations:
•
You have configured the software by using the Cisco Router Web Setup tool, and you want to
configure additional advanced software features by using the command-line interface (CLI).
•
You want to configure the software using only the CLI.
Note
We strongly recommend that network administrators with minimal familiarity with Cisco routers use the
Cisco Router and Security Device Manager (SDM)—a web-based configuration tool that allows you to
configure LAN and WAN interfaces, routing, Network Address Translation (NAT), firewalls, VPNs, and
other features on your router. To obtain the SDM release notes and other SDM documentation, go to
and click the
Technical Documentation
link.
Page 12 / 196
12
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Preface
Organization
See the “
Organization
” section of this preface to help you decide which chapters contain the information
you need to configure your router.
Organization
This guide contains the following information:
Part 1: Getting Started
•
Chapter 1, “Basic Router Configuration”
—Describes how to configure basic router features and
interfaces.
Part 2: Configuring Your Router for Ethernet and DSL Access
•
Chapter 2, “Sample Network Deployments”
—Provides a road map for Part 2.
•
Chapter 3, “Configuring PPP over Ethernet with NAT”
—Provides instructions on how to configure
PPPoE with Network Address Translation (NAT) on your Cisco router.
•
Chapter 4, “Configuring PPP over ATM with NAT”
—Provides instructions on how to configure
PPPoA with Network Address Translation (NAT) on your Cisco router.
•
Chapter 5, “Configuring a LAN with DHCP and VLANs”
—Provides instructions on how to
configure your Cisco router with multiple VLANs and to have it act as a DHCP server.
•
Chapter 6, “Configuring a VPN Using Easy VPN and an IPSec Tunnel”
—Provides instructions on
how to configure a virtual private network (VPN) with a secure IP tunnel using the Cisco Easy VPN.
•
Chapter 7, “Configuring VPNs Using an IPSec Tunnel and Generic Routing
Encapsulation”
—Provides instructions on how to configure a VPN with a secure IP tunnel and
generic routing encapsulation (GRE).
•
Chapter 8, “Configuring a Simple Firewall”
—Provides instructions on how to configure a basic
firewall on your Cisco router.
•
Chapter 9, “Configuring a Wireless LAN Connection”
—Provides instructions on how to configure
a wireless LAN connection on your Cisco router.
•
Chapter 10, “Sample Configuration”
—Presents a summary configuration example showing features
configured in the preceding chapters of this part of the guide.
Part 3: Configuring Additional Features and Troubleshooting
•
Chapter 11, “Additional Configuration Options”
—Provides a road map for Part 3.
•
Chapter 12, “Configuring Security Features”
—Explains basic configuration of Cisco IOS security
features, including firewall and VPN configuration.
•
Chapter 13, “Configuring Dial Backup and Remote Management”
—Provides instructions on how to
configure your Cisco router for dial backup and remote management.
•
Chapter 14, “Troubleshooting”
—Provides information on identifying and solving problems with the
ADSL line and the telephone interface. Also explains how to recover a lost software password.
Part 4: Reference Information
•
Appendix A, “Cisco IOS Software Basic Skills”
—Explains what you need to know about Cisco IOS
software before you begin to configure it.
•
Appendix B, “Concepts”
—Provides general concept explanations of features.
•
Appendix C, “ROM Monitor”
—Describes the use of the ROM Monitor (ROMMON) utility.
Page 13 / 196
13
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Preface
Conventions
•
Appendix D, “Common Port Assignments”
—Describes the currently assigned Transmission
Control Protocol (TCP) and User Datagram Protocol (UDP) port numbers.
•
Index
Conventions
This guide uses the conventions described in the following sections for instructions and information.
Notes, Cautions, and Timesavers
Notes, cautions and time-saving tips use the following conventions and symbols:
Note
Means
reader take note
. Notes contain helpful suggestions or references to materials not contained in
this guide.
Caution
This caution symbol means
reader be careful
. In this situation, you might do something that could result
in equipment damage or loss of data.
Timesaver
This symbol means
the described action saves time
.
Command Conventions
Table 1
describes the command syntax used in this guide.
Table 1
Command Syntax Conventions
Convention
Description
boldface
Commands and keywords.
italic
Command input that is supplied by you.
[ ]
Optional keywords and default responses to system
prompts appear within square brackets.
{
x
|
x
|
x
}
A choice of keywords (represented by
x
) appears in
braces separated by vertical bars. You must select
one.
^ or Ctrl
Represents the key labeled
Control
. For example,
when you read
^D
or
Ctrl-D
, you should hold down
the Control key while you press the D key.
screen font
Examples of information displayed on the screen.
boldface screen
font
Examples of information that you must enter.
Page 14 / 196
14
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Preface
Related Documents
Related Documents
The following publications provide related information on these routers:
•
Cisco 850 Series and Cisco 870 Series Access Routers Cabling and Setup Quick Start Guide
•
Cisco 850 Series and Cisco 870 Series Access Routers Hardware Installation Guide
•
Cisco Router and Security Device Manager (SDM) Quick Start Guide
•
Cisco Access Router Wireless Configuration Guide
•
Upgrading Memory in Cisco 800 Series Routers
•
Regulatory Compliance and Safety Information for Cisco 800 Series and SOHO Series Routers
•
Declarations of Conformity and Regulatory Information for Cisco Access Products with 802.11a/b/g
and 802.11b/g Radios
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional
information, see the monthly
What’s New in Cisco Product Documentation
, which also lists all new and
revised Cisco technical documentation, at:
Subscribe to the
What’s New in Cisco Product Documentation
as a Really Simple Syndication (RSS) feed
and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free
service and Cisco currently supports RSS Version 2.0.
Page 15 / 196
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Getting Started

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