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Chapter 12. Deploying Crystal Enterprise... > Using Crystal Enterprise with Networ...

Using Crystal Enterprise with Network Address Translation

Network Address Translation (NAT) takes IP Filtering one level further by masking the IP address of the internal server when its packet gets through the firewall. NAT makes it appear as if all traffic from inside the network comes from a different IP address. NAT hides internal IP addresses by converting all internal host addresses to the address of the firewall as packets are routed through the firewall. The firewall then retransmits the data payload of the internal host from its own address using a translation table to keep track of which ports/sockets on the exterior interface equate to which ports/sockets on the interior interface.

Comparing NAT with Standard TCP/IP Communication

To investigate how the NAT firewall configuration works in practice, let’s first look at how a standard TCP/IP communication application would operate using a Telnet application as an example. Here, the communication is set up on a single pipe with all interaction passing through the same communication channel.


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