Freescale Semiconductor TWR-MCF52259-Ethenet - Manual (Page 29)

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Default Gateway
192.168.1.1
192.168.1.2
192.168.1.3
192.168.1.4
192.168.1.5
Router/Gateway
running NAT
IP=10.1.2.3
internet
10.1.2.3 192.168.1.0
Default Gateway is where packets
addressed outside the subnet are
sent to.
Node 192.168.1.5 needs to send a packet to 207.68.172.246 (msn.com)
Node 192.168.1.5 identifies that 207.68.172.246 is outside the subnet
(255.255.255.0 )
The packet is sent to 192.168.1.0, the default gateway
NAT translates the source field to 10.1.2.3
The internet sees a packet from 10.1.2.3 to 207.68.172.246
Local Global