Types of Network Address Translation (NAT) Implementation

Network Address Translation or NAT, is a process of converting or translating a set of IP addresses to another set of IP addresses. 

Benefits of NAT:

  • Solve IPv4 exhaustion issue by conserving IP address space.
  • Cost effective as can connect multiple devices to Internet without to purchase multiple public IP
  • Enhance security by hiding the internal devices on a private network behind single public IP
  • Simplifies network reconfiguration as internal IP  are hidden from external networks
  • Easy to manage and setup

Here are different types of NAT and its brief description

Types of NAT Description Example
Static NAT One to One Translation (Ports or IP) One private IP to public IP
Dynamic NAT Many to Many Translation (Pool) A set of private IP addresses mapped to pool of public IP addresses
(PAT) Port Address Translation   (NAT Overload) Many to One (with Ports) Mapped private IP addresses to one public IP but different port assigned to each private IP

Here is the sample NAT configuration on Cisco Routers –> NAT Configuration on Cisco Routers (Static, Dynamic and NAT Overload)

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