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Different types of NAT - Static NAT, Dynamic NAT and PAT

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Static NAT (Network Address Translation) - Static NAT (Network Address Translation) is one-to-one mapping of a private IP address to a public IP address. Static NAT (Network Address Translation) is useful when a network device inside a private network needs to be accessible from internet.

Static NAT

Dynamic NAT (Network Address Translation) - Dynamic NAT can be defined as mapping of a private IP address to a public IP address from a group of public IP addresses called as NAT pool. Dynamic NAT establishes a one-to-one mapping between a private IP address to a public IP address. Here the public IP address is taken from the pool of IP addresses configured on the end NAT router. The public to private mapping may vary based on the available public IP address in NAT pool.

Dynamic NAT

PAT (Port Address Translation) - Port Address Translation (PAT) is another type of dynamic NAT which can map multiple private IP addresses to a single public IP address by using a technology known as Port Address Translation.

Here when a client from inside network communicate to a host in the internet, the router changes the source port (TCP or UDP) number with another port number. These port mappings are kept in a table. When the router receive from internet, it will refer the table which keep the port mappings and forward the data packet to the original sender.

Port Address Translation PAT

              Jajish Thomason Google+
Related Topics
• IPv4 Addresses
• Private IPv4 Addresses
• What is NAT (Network Address Translation)
• What are the Advantages and Disadvantages of NAT (Network Address Translation)
• Different types of NAT - Static NAT, Dynamic NAT and PAT
• NAT Address types - Inside Local, Inside Global, Outside Local, Outside Global
• How to configure static NAT in a Cisco Router
• How to configure dynamic NAT in a Cisco Router
• How to configure PAT (Port Address Translation or NAT overload) in a Cisco Router
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