NAT (Network Address Translation)
NAT - Network Address Translation allows private IP addressing schemes (i.e. those within an organisation) to communicate with public addressing schemes (such as the Internet) and the packets to be routed between.
As there is obviously a finite number of IP addresses on the Internet, an organisation may only be allocated a small number of IP addresses for the outside world to see (possibly given to a router or firewall). Therefore, all its internal IP addresses can be numbered as the organisation wants, but must be translated by the router or firewall. Before they leave the organisation’s network
Network administrators create a NAT table that does the global-to-local and local-to-global IP address mapping. NAT can also be used in conjunction with policy routing. NAT can be statically defined or it can be set up to dynamically translate from and to a pool of IP addresses.
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