Cisco Systems OL-6426-02 manual Configure the Wireless Interface, Configuring a Loopback Interface

Chapter 1 Basic Router Configuration

Configuring Basic Parameters

Configure the Wireless Interface

The wireless interface enables connection to the router through a wireless LAN connection. For more information about configuring a wireless connection, see Chapter 9, “Configuring a Wireless LAN Connection” and the Cisco Access Router Wireless Configuration Guide.

Configuring a Loopback Interface

The loopback interface acts as a placeholder for the static IP address and provides default routing information.

For complete information on the loopback commands, see the Cisco IOS Release 12.3 documentation set.

Perform these steps to configure a loopback interface:

	Command	Purpose
Step 1
	interface type number	Enters interface configuration mode.
	Example:
	Router(config)# interface Loopback 0
	Router(config-int)#
Step 2
	ip address ip-address mask	Sets the IP address and subnet mask for the
		loopback interface.
	Example:
	Router(config-int)#ip address 10.108.1.1
	255.255.255.0
	Router(config-int)#
Step 3
	exit	Exits configuration mode for the loopback
		interface and returns to global configuration
	Example:	mode.
	Router(config-int)# exit
	Router(config)#

Configuration Example

	The loopback interface in this sample configuration is used to support Network Address Translation
	(NAT) on the virtual-template interface. This configuration example shows the loopback interface
	configured on the Fast Ethernet interface with an IP address of 200.200.100.1/24, which acts as a static
	IP address. The loopback interface points back to virtual-template1, which has a negotiated IP address.
	!
	interface loopback 0
	ip address 200.200.100.1 255.255.255.0 (static IP address)
	ip nat outside
	!
	interface Virtual-Template1
	ip unnumbered loopback0
	no ip directed-broadcast
	ip nat outside
	Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02		1-9