What is Network Address Translation (NAT)? – POFTUT

What is Network Address Translation (NAT)?

In corporate networks or internet works on dominantly on IP protocol. IP protocols have two versions. Most popular default one is IPv4 and other next generation by not so widespread version is IPv6. IPv6 have a lot of advantages against IPv4 but as you know changing and infrastructure through world wide is not so easy job. Now our question is what is Network Address Translation simply NAT.

NAT Example

In Local Area Networks (LAN) IP range of , and are used. These IP ranges are dedicated from IANA and do not used in internet. Other ip addresses are used by Internet. So the problem is what will happen when a host in the LAN want to access to the internet because LAN IP range cannot be used for internet? There must be an IP address used and reserved for internet. The address will be used for internet related network traffic. We will continue with the following IP address.

NAT Topology


To access destination IP address LAN host goes though firewall . The IP address is used by in the internet to identify itself. Packets arriving to the have source address . We call this source address translation operation as NAT simply. Actually there are different type of mechanisms in NAT.

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