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
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Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
APPENDIX
B
Concepts
This appendix contains conceptual information that may be useful to Internet service providers or
network administrators when they configure Cisco routers. To review some typical network scenarios,
see
Chapter 2, “Sample Network Deployments.” For information on additional details or configuration
topics, see Chapter 11, “Additional Configuration Options.”
The following topics are included in this appendix:
• ADSL
• SHDSL
• Network Protocols
• Routing Protocol Options
• PPP Authentication Protocols
• TAC ACS+
• Network Interfaces
• Dial Backup
• NAT
• Easy IP (Phase 1)
• Easy IP (Phase 2)
• QoS
• Access Lists
ADSL
ADSL is a technology that allows both data and voice to be transmitted over the same line. It is a
packet-based network technology that allows high-speed transmission over twisted-pair copper wire on
the local loop (“last mile”) between a network service provider (NSP) central office and the customer
site, or on local loops created within either a building or a campus.
The benefit of ADSL over a serial or dialup line is that it is always on and always connected, increasing
bandwidth and lowering the costs compared with a dialup or leased line. ADSL technology is
asymmetric in that it allows more bandwidth from an NSP central office to the customer site than from
the customer site to the central office. This asymmetry, combined with always-on access (which
eliminates call setup), makes ADSL ideal for Internet and intranet surfing, video on demand, and remote
LAN access.