Network Address Translation (NAT)

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Network Address Translation (NAT):

Organizations that use private IP addresses have the advantage of using a private addressing in a network, while using the Internet at the same time, by way of implementing Network Address Translation (NAT). NAT is defined in RFC 1631 and allows communication with hosts that don’t have a valid registered IP address through the Internet. This allows hosts using private addresses or addresses that aren’t Internet-ready to be used while communicating with other hosts on the web. This is achieved by taking a registered IP address to be used in place of the private address when interacting with other hosts on the Internet. NAT changes the private IP addresses to a publicly registered IP addresses inside each IP packet.

There are several types of NAT: Static NAT; Dynamic NAT; Overloading NAT with Port Address Translation (PAT).

Definitions of each, are as follows: 

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