Router Configuration:
Router(config)#
Router(config)#interface gigabit 0/?
Router(config-if)#ip nat inside
Router(config-if)#ip address 192.168.100.1 255.255.255.0
Router(config-if)#no shutdown
Router(config-if)#
Router(config-if)#interface gigabitethernet 0/1
Router(config-if)#ip nat outside
Router(config-if)#ip address dhcp
Router(config-if)#no shutdown
Router(config)#
Router(config)#ip nat inside source static 192.168.100.2
200.153.189.62
Router(config)#
Router(config)#
show ip nat transaltion
Port Address Translation (PAT)
This is also known as NAT overload. In this, many local (private) IP addresses can be translated
to single registered IP address. Port numbers are used to distinguish the traffic i.e.; which traffic
belongs to which IP address. This is most frequently used as it is cost effective as thousands of
users can be connected to the Internet by using only one real global (public) IP address.
Port Address Translation (PAT) is an extension of Network Address Translation (NAT) that
permits multiple devices on a LAN to be mapped to a single public IP address to conserve IP
addresses.