Network Address Translation (NAT) is usually composed of two steps: the process by which a public IP address is translated into a mapped private IP address and the process to undo translation for returning traffic. Private IP addresses used in inside networks are not routable on Internet. NAT can provide flexibility for mapping multiple internal private IP addresses to one fixed public IP address for Internet access in order to save public IPv4 addresses used due to IPv4 address depletion globally.
It is NOT recommended to use only NAT for security protection. Rather, Firewalls should be used for such purpose while they can also provide NAT functions.
There is no urgency for departments to return public IPv4 addresses, which were assigned to them before, back to ITSC. However, departments are still recommended to start enabling NAT functions on their Firewalls when they implement new Firewalls for the future because absolutely no additional IPv4 addresses can be assigned to departments by ITSC anymore. Therefore, departments should make good use of the IPv4 addresses already assigned to them.
Information Technology Services Centre
Version 0.1, Aug 2015
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