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
CHAPTER
5-1
OL-6426-03
5
Configuring a LAN with DHCP and VLANs
The Cisco 1800 series integrated services fixed-configuration routers support clients on both physical
LANs and virtual LANs (VLANs). The routers can use the Dynamic Host Configuration Protocol
(DHCP) to enable automatic assignment of IP configurations for nodes on these networks. Other
interfaces and configurations of the VLANs are described in the
“Switch Port Configurations” section
on page 5-7.
DHCP
DHCP, which is described in RFC 2131, uses a client/server model for address allocation. As an
administrator, you can configure your Cisco
1800 integrated services fixed-configuration router to act as
a DHCP server, providing IP address assignment and other TCP/IP-oriented configuration information
to your workstations. DHCP frees you from having to manually assign an IP address to each client.
When you configure a DHCP server, you must configure the server properties, policies, and DHCP
options.
Note Whenever you change server properties, you must reload the server with the configuration data from the
Network Registrar database.
VLANs
The Cisco 1800 series integrated services routers (fixed) support eight Fast Ethernet ports on which you
can configure VLANs. See the
“Switch Port Configurations” section on page 5-7 for a description of the
interfaces and features that can be configured on the switch ports and a link to a document containing
the configuration procedures.
VLANs enable networks to be segmented and formed into logical groups of users, regardless of the
user’s physical location or LAN connection.
Configuration Tasks
Perform the following tasks to configure this network scenario:
• Configure DHCP
1 Fast Ethernet LAN (with multiple networked devices)
2 Router and DHCP server—Cisco 1800 series integrated services router—connected to the Internet
3 VLAN 1
4 VLAN 2