Addressing the IP Address Shortages with NAT

Network Address Translation (NAT) and Classless InterDomain Routing (CIDR) are alternative options to addressing IP address shortage problems.
According to this Vanguard article, NAT enables a LAN to use one set of IP address for internal traffic and a second set of address for external traffic. This allows a company to shield internal addresses from the public Internet.


“While NAT came into being in the 1990’sas a popular tool for alleviating the IPv4 address exhaustion problem, it eventually became an indispensable tool for most home and small-business networks. NAT is a Cisco version of Port Address Translation (PAT), and enables a LAN to use one set of IP address for internal traffic and a second set of address for external traffic. This allows a company to shield internal addresses from the public Internet.

“NAT is used by a device (firewall, router, or computer) that sits between an internal network and the rest of the world. There are TWO main types of NAT : dynamic and static. In static NAT, the public IP address is always the same, allowing an internal host, such as a Web server, to have an unregistered private IP address and still be reached over the Internet.”

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