4.2. Network Address Translation

The tasks of hiding the identity of internal clients, masking the design of your private network, and keeping public IP address leasing costs to a minimum are all made simple through the use of Network Address Translation (NAT). NAT is a mechanism for converting the internal IP addresses found in packet headers into public IP addresses for transmission over the Internet. NAT was developed to allow private networks to use any IP address set without causing collisions or conflicts with public Internet hosts with the same IP addresses. In effect, NAT translates the IP addresses of your internal clients to leased addresses outside your environment.

NAT offers numerous benefits, such as being able to connect an entire ...

Get CISSP®: Certified Information Systems Security Professional: Study Guide, Fourth Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.