Types of NAT
There are many types of NAT translations. Each type has its own advantages, disadvantages, and real-world use. In this section, you will learn about their characteristics and operations, and how to configure each type of NAT on a Cisco IOS router.
Static NAT
Static NAT uses a one-to-one mapping of the inside local address with the inside global address. This type of NAT mapping does not change—as the name implies, the mapping remains constant. This type of NAT is very useful when you want to allow external users on the internet to access a device such as a web server that sits on your internal private network in your organization.
Let's imagine that your organization has a web server located on a private network and you are tasked to allow users from the internet access to the server. To complete this task, you can create a one-to-one static mapping between the web server's private IP address (inside local) and the public IP address on the router...