Server Public NAT:

Addresses to publicly NAT a server (as opposed to internally NAT a network in the event of conflicting IP addressing as shown in other screens) are set in the Server Dialog.
In this example, the administrator has allowed One-To-One NAT for a private range to map to a matching public range.  In this way, internal users who need public addresses can be placed into the 192.168.223.130-150 range and automatically receive a unique, fixed, public address without having to reconfigure the firewall.