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Cisco Secure Router 520 Series Software Configuration Guide
OL-14210-01
Chapter 3 Configuring PPP over Ethernet with NAT
Configure Network Address Translation
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 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 concepts, see
Appendix B, “Concepts.”
Step 6
exit
Example:
Router(config-if)# exit
Router(config)#
Exits configuration mode for the Fast Ethernet
interface.
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 the
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 0.0.0.255
Defines a standard access list indicating which
addresses need translation.
Note All other addresses are implicitly denied.
Command Purpose