Sample Configurations

The following three situations are representative of those I have encountered in the real world. Each is designed to demonstrate what people typically do with NAT and how the situations would be implemented on the chosen platform.

Creating a Simple Network with NAT

The Situation

You work for a small company with a few hosts on a flat network segment. Your firewall runs on a Windows NT platform. The ISP has given you only a /29 net block, which effectively gives you six hosts you can use on the outside segment. Because the firewall and Internet router each need a unique IP address, this leaves a total of four addresses that can be used for other hosts (see Figure 10.8).

Figure 10.8. Simple network with NAT
The Goals
  • Allow ...

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