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Cisco IOS Software Releases 12.2 T

NAT - Ability to Use Route Maps with Static Translations

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Table Of Contents

NAT—Ability to Use Route Maps with Static Translations

Feature Overview

Benefits

Related Documents

Supported Platforms

Supported Standards, MIBs, and RFCs

Configuration Tasks

Enabling Static NAT Route Mapping

Verifying Static NAT Route Mapping

Configuration Examples

Enabling Static NAT Route Mapping Example


NAT—Ability to Use Route Maps with Static Translations

Feature History

Release
Modification

12.2(4)T

This feature was introduced.

12.2(4)T2

Support for the Cisco 7500 series routers was added.


This document describes the NAT—Ability to Use Route Maps with Static Translations feature. It includes the following sections:

•Feature Overview

•Supported Platforms

•Supported Standards, MIBs, and RFCs

•Configuration Tasks

•Configuration Examples

Feature Overview

Previous to this feature, route mapping was supported only with dynamic Network Address Translation (NAT) translation.

The NAT—Ability to Use Route Maps with Static Translations feature enables NAT multihoming capability with static address translations. Multihomed internal networks now can host common services such as the Internet and Domain Name System (DNS), which are accessed from different outside networks.

Note Network static support is not included in this feature.

Benefits

•The ability to configure route map statements provides the option of using IP Security (IPsec) with NAT.

•Translation decisions can be made based on the destination IP address when static translation entries are used.

Related Documents

•Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services

•Cisco IOS IP Configuration Guide

Supported Platforms

•Cisco 2500 series

•Cisco 2600 series

•Cisco 3620 router

•Cisco 3640 router

•Cisco 3660 router

•Cisco 7100 series

•Cisco 7200 series

•Cisco 7500 series

Determining Platform Support Through Feature Navigator

Cisco IOS software is packaged in feature sets that support specific platforms. To get updated information regarding platform support for this feature, access Feature Navigator. Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image.

To access Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions at http://www.cisco.com/register.

Feature Navigator is updated when major Cisco IOS software releases and technology releases occur. As of May 2001, Feature Navigator supports M, T, E, S, and ST releases. You can access Feature Navigator at the following URL:

http://www.cisco.com/go/fn

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

No new or modified RFCs are supported by this feature.

Configuration Tasks

See the following sections for configuration tasks for the NAT—Ability to Use Route Maps with Static Translations feature. Each task in the list is identified as either required or optional:

•Enabling Static NAT Route Mapping (required)

•Verifying Static NAT Route Mapping (optional)

Enabling Static NAT Route Mapping

To enable route mapping with static NAT configurations, use the following command in global configuration mode:

Command
Purpose

Router(config)# ip nat inside source {list {access-list-number | access-list-name} pool pool-name [overload] | static local-ip global-ip route-map map-name}

Enables route mapping with static NAT translation configured on the NAT inside interface.

Verifying Static NAT Route Mapping

To verify the static NAT route mapping configuration, use the following command in privileged EXEC mode:

Command
Purpose

Router# show ip nat translations [verbose]

Displays active NAT translations.

Configuration Examples

This section provides the following configuration example:

•Enabling Static NAT Route Mapping

Enabling Static NAT Route Mapping Example

The following example shows the use of route mapping with static NAT translations: 

interface Ethernet3

 ip address 209.165.201.1 255.255.255.0

 ip nat outside

 media-type 10BaseT

!

interface Ethernet4

 ip address 209.165.201.5 255.255.255.0

 ip nat outside

 media-type 10BaseT

!

interface Ethernet5

 ip address 209.165.201.8 255.255.255.0

 ip nat inside

 ip policy route-map isp1

 media-type 10BaseT

!

router rip

 network 201.165.200.1

 network 201.165.200.29

!

 ip nat inside source static 209.165.201.10 192.68.1.21 route-map isp2

 ip nat inside source static 209.165.201.12 172.68.1.21 route-map isp1

 ip nat inside source static 209.165.201.23 192.68.1.11 route-map isp2

 ip nat inside source static 209.165.201.27 172.68.1.11 route-map isp1


 access-list 101 permit ip 209.165.201.228 0.0.0.255 172.0.0.0 0.255.255.255.

 access-list 102 permit ip 209.165.201.230 0.0.0.255 192.0.0.0 0.255.255.255

!

route-map isp2 permit 10

 match ip address 102

 set ip next-hop 209.165.201.30

!

route-map isp1 permit 10

 match ip address 101

 set ip next-hop 209.165.201.29

Related Commands

Command
Description

clear ip nat translation

Clears dynamic NAT translations from the translation table.

ip nat

Designates that traffic originating from or destined for the interface is subject to NAT.

ip nat inside destination

Enables NAT of the inside destination address.

ip nat outside source

Enables NAT of the outside source address.

ip nat pool

Defines a pool of IP addresses for NAT.

ip nat service

Enables a port other than the default port.

show ip nat statistics

Displays NAT statistics.

show ip nat translations

Displays active NAT translations.