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| About NAT - How does Network Address Translation (NAT) work?
Feedback received on this FAQ entry:
- Network Address Translation (NAT) is the process where a network device, usually a firewall, assigns a public address to a computer or group of computers inside a network. It limits the number of public IP addresses an organization or company must use.
How it works.
A computer inside a network makes a request to a computer on the Internet. Routers within the network recognize that the request is not for a resource inside the network, so they send the request to the firewall. The firewall sees the request from the computer with the internal IP. It then makes the same request to the Internet using its own public address, and returns the response from the Internet resource to the computer inside the private network. From the perspective of the resource on the Internet, it is sending information to the address of the firewall. From the perspective of the workstation, it appears that communication is directly with the site on the Internet. When used in this way, all users inside the private network access the Internet have the same public IP address when they use the Internet. That means only one public addresses is needed for hundreds or even thousands of users. Thus it allows the router to assign non-publically routable IP addresses to the computers on the network.
This can be achieved in these forms: static, Dynamic, overloading and overlapping natting
by Doctor Olds