NAT Overloading

Network Address Translation Overloading, is also known as Port Address Translation that is commonly speak as the PAT and it is designed to map the multiple private IP addresses to a single public IP address and that concept is called many-to-one by using different ports. In the other concept, a single public IP address can be used for multiples internal private IP addresses, hence the term is called overloading.

Fig 1:NAT Overloading

NAT Overloading Configuration

Networkeducative-Router# configure terminal

Networkeducative-Router(config)# interface fastethernet0/0

Networkeducative-Router(config-if)# ip nat inside

Networkeducative-Router(config-if)# interface serial0/0

Networkeducative-Router(config-if)# ip nat outside

Networkeducative-Router(config-if)# exit

Networkeducative-Router(config)# access-list 100 remark == [Control NAT Service]==

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

Networkeducative-Router(config)# ip nat inside source list 100 interface serial 0/0 overload

For NAT Verification

Networkeducative-Router# show ip nat translations

Networkeducative-Router# show ip nat statistics

For clear NAT Table

Networkeducative-Router# clear ip nat translation *