59.24 NAT

Network Address Translation (NAT) is a method of mapping an IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. The technique was originally used to bypass the need to assign a new address to every host when a network was moved, or when the upstream Internet service provider was replaced, but could not route the network's address space. It has become a popular and essential tool in conserving global address space in the face of IPv4 address exhaustion. One Internet-routable IP address of a NAT gateway can be used for an entire private network.As network address translation modifies the IP address information in packets, NAT implementations may vary in their specific behavior in various addressing cases and their effect on network traffic. The specifics of NAT behavior are not commonly documented by vendors of equipment containing NAT implementations.



Network Address Translation (NAT) is a method used in networking that allows one or more local IP addresses to be translated into one or more global IP addresses and vice versa. It enables multiple devices on a local network to access the internet using a single public IP address. NAT is primarily used to conserve the limited number of available IPv4 addresses and to simplify network address management[1].

Problems NAT Solves

NAT Translations Method

One to One NAT (Full-cone NAT)

Address restricted NAT

Port restricted NAT

Symmetric NAT

Pros of NAT

Cons of NAT

It is important to note that NAT, by itself, does not provide security services such as firewalling, monitoring, antivirus protection, intrusion detection, application security, or zero trust services. It is primarily a service that conserves and organizes IP addresses[4].

In summary, NAT is a valuable tool in network management that helps to conserve IP addresses and can provide a level of obfuscation for internal network devices. However, it also introduces complexity, potential performance issues, and compatibility challenges with certain applications and protocols.

Also Read

  1. https://www.geeksforgeeks.org/network-address-translation-nat/ ↩︎ ↩︎

  2. https://www.omnisecu.com/cisco-certified-network-associate-ccna/advantages-and-disadvantages-of-nat.php ↩︎ ↩︎ ↩︎

  3. https://www.tutorialspoint.com/advantages-and-disadvantages-of-nat ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

  4. https://www.comptia.org/content/guides/what-is-network-address-translation ↩︎

Thoughts 🤔 by Soumendra Kumar Sahoo is licensed under CC BY 4.0