![]() ![]() In this configuration, you have multiple clients on your inside network wanting to access an outside network (usually the Internet). PAT is commonly known as “NAT overload” (or sometimes just “overload”). ![]() From these configurations, you can perform a variety of functions. If you dig into NAT a little deeper, you will discover that there are really three ways to configure it. The basic concept of NAT is that it allows inside/internal hosts to use the private address spaces (10/8, 172.16/12, and 192.168/16 networks-see RFC1918), go through the internal interface of a router running NAT, and then have the internal addresses translated to the router's public IP address on the external interface that connects to the Internet. NAT was designed to be a solution to the lack of public IP addresses available on the Internet. Then, I'll show you how to configure PAT on a Cisco router.īefore discussing PAT, it will help to describe what NAT does in general. Let's take a look at the distinctions between NAT and PAT and see how they are typically used. It can provide an excellent solution for a company that has multiple systems that need to access the Internet but that has only a few public IP addresses. Port Address Translation (PAT) is a special kind of Network Address Translation (NAT).
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