NAT Overload (PAT)


2n

If you have few global IP address and hundreds of inside local address to translate. In such situation you need to use NAT Overload, also known as PAT.

In this example our internal network is using 192.168.0.0 network and we are using only one global IP address 200.2.2.1

configure Router R1 as given below

Router>enable

Router#configure terminal

Router(config)#hostname R1

R1(config)#ip route 0.0.0.0 0.0.0.0 serial 0/0

R1(config)#access-list 100 permit ip 192.168.0.0 0.0.0.255 any

R1(config)#ip nat inside source list 100 interface serial 0/0 overload

R1(config)#interface fastEthernet 0/0

R1(config-if)#ip nat inside

R1(config-if)#exit

R1(config)#interface serial 0/0

R1(config-if)#ip nat outside

R1(config-if)#exit

R1(config)#

 

To verify PAT go on R1 and run show ip nat translations

R1#show ip nat translations

 

Also you can obtain statistics on the overload NAT service

R1# show ip nat statistics

 

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