NAT ADVANTANGE AND DISADVANTAGE

The main advantage of NAT is IP address reuse, and the sharing of globally unique IP addresses between many hosts from a single LAN. NAT also serves users transparently. In other words, they do not need to know about NAT to get on the Internet from a private network. Finally, NAT helps shield users of a private network against access from the outside.

NAT does have some disadvantages, including:
The impact of NAT on certain applications that have IP addresses in their message payload. These IP addresses must be translated as well, which increases load on the router CPU. This extra workload on routers hinders network performance.
NAT hides private IP addresses from public networks. It performs like access control which can be desirable, but can also be bad if legitimate remote access from the Internet to a device on the private network is desired.