Chapter 4 Configuring PPP over ATM with NAT

Configure Network Address Translation

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Command

Purpose

Step 1

 

 

ip nat pool name start-ip end-ip {netmask

Creates pool of global IP addresses for NAT.

 

netmask prefix-lengthprefix-length}

 

 

Example:

 

 

Router(config)# ip nat pool pool1

 

 

192.168.1.0 192.168.2.0 netmask 0.0.0.255

 

 

Router(config)#

 

Step 2

 

 

ip nat inside source {list access-list-number}

Enables dynamic translation of addresses on the

 

{interface type number pool name} [overload]

inside interface.

 

Example 1:

The first example shows the addresses permitted

 

by the access list 1 to be translated to one of the

 

 

 

Router(config)# ip nat inside source list 1

addresses specified in the dialer interface 0.

 

interface dialer 0 overload

The second example shows the addresses

 

 

 

or

permitted by access list acl1 to be translated to one

 

 

of the addresses specified in the NAT pool pool1.

 

Example 2:

For details about this command and additional

 

 

 

Router(config)# ip nat inside source list

parameters that can be set, as well as information

 

acl1 pool pool1

about enabling static translation, see the Cisco

 

 

 

 

IOS IP Command Reference, Volume 1 of 4:

 

 

Addressing and Services.

Step 3

 

 

interface type number

Enters configuration mode for the VLAN (on

 

 

which the Fast Ethernet LAN interfaces

 

Example:

[FE2–FE9] reside) to be the inside interface

 

Router(config)# interface vlan 1

for NAT.

 

Router(config-if)#

 

Step 4

 

 

ip nat {inside outside}

Applies NAT to the Fast Ethernet LAN interface

 

 

as the inside interface.

 

Example:

For details about this command and additional

 

 

 

Router(config-if)# ip nat inside

parameters that can be set, as well as information

 

Router(config-if)#

about enabling static translation, see the Cisco

 

 

 

 

IOS IP Command Reference, Volume 1 of 4:

 

 

Addressing and Services.

Step 5

 

 

no shutdown

Enables the configuration changes just made to the

 

 

Ethernet interface.

 

Example:

 

 

Router(config-if)# no shutdown

 

 

Router(config-if)#

 

Step 6

 

 

exit

Exits configuration mode for the Fast Ethernet

 

 

interface.

 

Example:

 

 

Router(config-if)# exit

 

 

Router(config)#

 

 

 

 

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

4-10

OL-6426-02

 

 

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Cisco Systems OL-6426-02 manual About enabling static translation, see the Cisco, FE2-FE9 reside to be the inside interface