Network Address Translation (NAT) is a standard used to allow multiple PCs on a private network to share a single, globally routable IPv4 address. NAT enables a user to have a large set of addresses internally and usually one address externally. The main reason NAT is often deployed is because IPv4 addresses are getting scarce. NAT is an immediate, but temporary, solution to the IPv4 address exhaustion problem that will eventually be rendered unnecessary with the deployment of the IPv6. The Internet Engineering Task Force has been aware of the impending depletion of the current address space for almost a decade.
The increasing use of NAT comes from a number of factors. The major factor is that there is a world shortage of IP addresses. As the Internet has grown, assigning perfectly good network addresses to private networks came to be seen as a waste. Under the Network Address Translation (NAT) standard, certain IP addresses were set aside for reuse by private networks. In......
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