Dynamic NAT works slightly differently in that private and public addresses are not mapped on a one-to-one basis. Instead, a range of public IP addresses is configured on the NAT device, and private internal clients will be mapped to an available address as necessary. The NAT table is built dynamically, avoiding the need for mappings to be statically defined. The address translation function that occurs is similar to that with static NAT, with the obvious exception that address mappings may change.
