Specifications
Table Of Contents
- Contents
- Preface
- Getting Started
- Basic Router Configuration
- Interface Port Labels
- Viewing the Default Configuration
- Information Needed for Configuration
- Configuring Basic Parameters
- Configuring Static Routes
- Configuring Dynamic Routes
- Configuring Enhanced IGRP
- Basic Router Configuration
- Configuring Your Router for Ethernet and DSL Access
- Sample Network Deployments
- Configuring PPP over Ethernet with NAT
- Configuring PPP over ATM with NAT
- Configuring a LAN with DHCP and VLANs
- Configuring a VPN Using Easy VPN and an IPSec Tunnel
- Configure the IKE Policy
- Configure Group Policy Information
- Apply Mode Configuration to the Crypto Map
- Enable Policy Lookup
- Configure IPSec Transforms and Protocols
- Configure the IPSec Crypto Method and Parameters
- Apply the Crypto Map to the Physical Interface
- Create an Easy VPN Remote Configuration
- Verifying Your Easy VPN Configuration
- Configuration Example
- Configuring VPNs Using an IPSec Tunnel and Generic Routing Encapsulation
- Configuring a Simple Firewall
- Configuring a Wireless LAN Connection
- Sample Configuration
- Configuring Additional Features and Troubleshooting
- Additional Configuration Options
- Configuring Security Features
- Configuring Dial Backup and Remote Management
- Troubleshooting
- Reference Information
- Cisco IOS Software Basic Skills
- Concepts
- ROM Monitor
- Common Port Assignments

11
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Preface
This software configuration guide provides instructions for using the Cisco command-line interface
(CLI) to configure features of the following Cisco
1800 series integrated services fixed-configuration
routers:
• Cisco 1801, Cisco 1802, and Cisco 1803 DSL Access Routers
• Cisco 1811 and Cisco 1812 Ethernet 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
• Documentation Feedback
• Obtaining Technical Assistance
• Obtaining Additional Publications and Information
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
http://www.cisco.com/go/sdm and click the Technical Documentation link.