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Best Practices

  • Use NAT in conjunction with a firewall. In larger environments where NAT is used simply to support connection of private IP address ranges to the public Internet, a firewall should be used to provide security. The security provided by NAT is too simplistic for larger, more complex environments.

  • Use ICS for small offices or homes that have a single subnet. ICS is very easy to enable and allows a small office or home to use a single connection for Internet traffic. In a limited environment like this, the security provided by ICS is acceptable.

  • Use NAT to conserve licensed IP addresses. IP addresses that can be used directly on the Internet are becoming more and more difficult to obtain. NAT facilitates reserving these scarce resources for interfaces that actually connect directly to the Internet, without limiting your use of TCP/IP within the corporate environment.

  • Implement a DNS server inside your network. When using NAT, it is best to have a DNS server on your internal network that can forward requests to the Internet root servers when necessary. If your only DNS server is the one provided by your ISP, all requests for host name resolution will have to be processed by the NAT server. An internal DNS will resolve internal host names without involving the NAT server.


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