Stateless Vs Statefull Firewalls | Proxy, Application, and Personal Firewalls
5.3 Implement NAT on Cisco ASA 9.x
This is a one-to-one permanent mapping. If you have 100 internal users and 100 global addresses, a one-to-one mapping can be done for every user. We do not usually have enough global addresses for each user. A typical use of a static mapping is this: We have a server on the inside of our network, or perhaps on a demilitarized zone (DMZ) interface off of our firewall, and we want to allow devices on the Internet access to that specific device.