| NAT is configured on a Cisco router with the config command. A pool of addresses must be created for the translation. The number of IP addresses required is generally small. As few as two IP addresses could provide NAT to thousands of nodes. Access lists can be applied to the NAT pool of addresses; static addresses can be provided to any hosts that might require them. The router must be informed as to the identification of both the inside and outside addresses that NAT will use to communicate with both the outside world and the LAN.