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7.6. Summary

NAT has always been an essential part of network design, whether for security reasons or to conserve IP addresses, and is a useful method for managing traffic flow. At its core, NAT provides the capability to hide the originating IP address of outbound traffic, thus providing an extra layer of security to protect the host's identity. NAT also provides a short-term solution to the depleting IPv4 addresses on the Internet. NAT provides the capability to use one IP for several thousand devices, thus conserving non-RFC 1918 IP addresses. With the cost of NAT devices going down each year and the increase in Internet usage, it is not surprising that NAT is a widely used feature.

The extensive flexibility of policy-based NAT of the SonicWALL Enhanced OS firmware allows the network designer to carefully sculpt a highly secure and robust environment, and introduce unique capabilities previously unavailable.


  

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