Cisco Systems OL-6426-02 Identifies the specified WAN interface as the NAT, Outside interface

Chapter 4 Configuring PPP over ATM with NAT

Configuration Example

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	Command		Purpose
Step 7
	interface type number		Enters configuration mode for the ATM WAN
			interface (FE0 or FE1) to be the outside interface
	Example:		for NAT.
	Router(config)#interface fastethernet 0
	Router(config-if)#
Step 8
	ip nat {inside outside}		Identifies the specified WAN interface as the NAT
			outside interface.
	Example:		For details about this command and additional
	Router(config-if)# ip nat outside		parameters that can be set, as well as enabling
	Router(config-if)#		static translation, see the Cisco IOS IP Command
			Reference, Volume 1 of 4: Addressing and
			Services.
Step 9
	no shutdown		Enables the configuration changes just made to the
			Ethernet interface.
	Example:
	Router(config-if)# no shutdown
	Router(config-if)#
Step 10
	exit		Exits configuration mode for the ATM interface.
	Example:
	Router(config-if)# exit
	Router(config)#
Step 11
	access-list access-list-number{deny permit}		Defines a standard access list permitting addresses
	source [source-wildcard]		that need translation.
	Example:		Note All other addresses are implicitly denied.
	Router(config)# access-list 1 permit
	192.168.1.0	0.0.0.255

Note If you want to use NAT with a virtual-template interface, you must configure a loopback interface. See Chapter 1, “Basic Router Configuration,” for information on configuring the loopback interface.

For complete information on NAT commands, see the Cisco IOS Release 12.3 documentation set. For more general information on NAT concepts, see Appendix B, “Concepts.”

Configuration Example

The following configuration example shows a portion of the configuration file for a client in the PPPoA scenario described in this chapter.

The VLAN interface has an IP address of 192.168.1.1 with a subnet mask of 255.255.255.0. NAT is configured for inside and outside.

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

OL-6426-02 4-11