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Article | REF: TE7550 V2

Firewalls. The pocketknife for enforcing computer security

Author: Maryline LAURENT

Publication date: October 10, 2017, Review date: January 3, 2024

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11. Other essential firewall functions

Firewalls can host many other functions, the most common of which are presented in this section.

11.1 Address translation (NAT)

NAT address translation enables terminals on the private network to interact with terminals on the public network, in which case the private network is privately addressed. NAT enables IP addresses to be translated in both directions: private addresses into public addresses, and public addresses into private addresses. NAT makes it possible to artificially increase the number of IP addresses available on the public network, thus addressing the delicate problem of the shortage of IPv4 public addresses. Private addresses that only make sense within a private network can be reassigned from one private network to another, thus increasing...

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