Advantages of NAT

In this article we will discuss Advantages of NAT, will make brief discussion on Advantages of NAT, In last article we discuss about Comparing NAT and PAT.

NAT provides many benefits, including:

  • NAT conserves the legally registered addressing scheme by allowing the privatization of intranets. NAT conserves addresses through application port-level multiplexing. With NAT overload, internal hosts can share a single public IPv4 address for all external communications. In this type of configuration, very few external addresses are required to support many internal hosts.
  • NAT increases the flexibility of connections to the public network. Multiple pools, backup pools, and load-balancing pools can be implemented to ensure reliable public network connections.
  • NAT provides consistency for internal network addressing schemes. On a network not using private IPv4 addresses and NAT, changing the public IPv4 address scheme requires the readdressing of all hosts on the existing network. The costs of readdressing hosts can be significant. NAT allows the existing private IPv4 address scheme to remain while allowing for easy change to a new public addressing scheme. This means an organization could change ISPs and not need to change any of its inside clients.

NAT hides user IPv4 addresses. Using RFC 1918 IPv4 addresses, NAT provides the side effect of hiding users and other devices’ IPv4 addresses. Some people consider this a security feature, however most experts agree that NAT does not provide security. A stateful firewall is what provides security on the edge of the network.

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