Implement Static NAT on Cisco ASA ASDM
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5.3 Implement NAT on Cisco ASA 9.x
5.3.a Static
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.