NAT

Network Address Translation (NAT, also known as network masquerading or IP-masquerading) involves re-writing the source and/or destination addresses of IP packets as they pass through a router or firewall.

Most systems using NAT do so in order to enable multiple hosts on a private network to access the Internet using a single public IP address.

NAT is a non-standard protocol

Local

Global

192.168.1.1

192.168.1.0

 

 

 

192.168.1.2

 

Router/Gateway

 

running NAT

 

 

192.168.1.3

 

IP=10.1.2.3

 

 

192.168.1.4

 

 

 

 

10.1.2.3

internet

Default Gateway is where packets

192.168.1.5addressed outside the subnet are sent to.

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Freescale Semiconductor TWR-MCF52259-Ethenet manual Nat