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Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
Chapter 11 Configuring PPP over Ethernet with NAT
Configuration Example
Note If you want to use NAT with a virtual-template interface, you must configure a loopback interface. See
the
“Basic Router Configuration” section on page 5-1 for information on configuring a loopback
interface.
For complete information on the NAT commands, see the Cisco IOS Release 12.3 documentation set.
For more general information on NAT concept, see the
“Cisco IOS Software Basic Skills” section on
page A-1.
Configuration Example
The following configuration example shows a portion of the configuration file for the PPPoE 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
Step 7
interface type number
Example:
Router(config)# interface fastethernet 4
Router(config-if)#
Enters configuration mode for the Fast Ethernet
WAN interface (FE4) to be the outside interface
for NAT.
Step 8
ip nat {inside | outside}
Example:
Router(config-if)# ip nat outside
Router(config-if)#
Identifies the specified WAN interface as the NAT
outside interface.
For details about this command and additional
parameters that can be set, as well as information
about enabling static translation, see
Cisco IOS IP
Command Reference, Volume 1 of 4: Addressing
and Services.
Step 9
no shutdown
Example:
Router(config-if)# no shutdown
Router(config-if)#
Enables the configuration changes just made to the
Ethernet interface.
Step 10
exit
Example:
Router(config-if)# exit
Router(config)#
Exits configuration mode for the Fast Ethernet
interface.
Step 11
access-list access-list-number {deny |
permit} source [source-wildcard]
Example:
Router(config)# access-list 1 permit
192.168.1.0 255.255.255.0
Defines a standard access list indicating which
addresses need translation.
Note All other addresses are implicitly denied.
Command Purpose