Topic discussion| What are the differences between different types of NAT?

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There are 3 types of NAT:

 
1. Static NAT 
In this, a single private IP address is mapped with a single Public IP address, i.e., a private IP address is translated to a public IP address. It is used in Web hosting.

 
2. Dynamic NAT 
In this type of NAT, multiple private IP addresses are mapped to a pool of public IP addresses. It is used when we know the number of fixed users who want to access the Internet at a given point in time.

 
3. Port Address Translation (PAT) 
This is also known as NAT overload. In this, many local (private) IP addresses can be translated to a single public IP address. Port numbers are used to distinguish the traffic, i.e., which traffic belongs to which IP address. This is most frequently used as it is cost-effective as thousands of users can be connected to the Internet by using only one real global (public) IP address.

Why Use NAT?

NAT is a straightforward enough process, but what is the point of it? Ultimately, it comes down to conservation and security.