Cisco Systems 78-11741-02 NAT Configuration Examples, Dynamic Inside Source Translation Example

Configuring IP Addressing

IP Addressing Examples

Figure 13 IP Helper Addresses

Network 192.168.1.0

E1

Server

192.168.1.19

E2

Network 10.44.0.0

Server

10.44.23.7

S1017a

The following example shows the configuration:

ip forward-protocol udp

!
interface ethernet	1
ip helper-address	10.44.23.7
interface ethernet	2
ip helper-address	192.168.1.19

NAT Configuration Examples

The following sections show NAT configuration examples.

Dynamic Inside Source Translation Example

The following example translates all source addresses passing access list 1 (having a source address from 192.168.1.0/24) to an address from the pool named net-208. The pool contains addresses from 171.69.233.208 to 171.69.233.223.

ip nat pool net-208 171.69.233.208 171.69.233.223 netmask 255.255.255.240 ip nat inside source list 1 pool net-208

!

interface serial 0

ip address 171.69.232.182 255.255.255.240 ip nat outside

!

interface ethernet 0

ip address 192.168.1.94 255.255.255.0 ip nat inside

!

access-list 1 permit 192.168.1.0 0.0.0.255

The following example translates all source addresses using a route map.

ip nat pool provider1-space 171.69.232.1 171.69.232.254 prefix-length 24 ip nat pool provider2-space 131.108.43.1 131.108.43.254 prefix-length 24

Cisco IOS IP Configuration Guide

IPC-61