The terms, inside and outside, are combined with the terms local and global to refer to specific addresses. In the figure, router R2 has been configured to provide NAT. It has a pool of public addresses to assign to inside hosts.

The figure shows how traffic is addressed that is sent from an internal PC to an external web server, across the NAT-enabled router. It also shows how return traffic is initially addressed and translated.

Note: The use of the outside local address is outside the scope of this course.