IP NAT is the portion of the IP Filter package that performs Network Address Translation. A major feature of most firewalls and routers these days is the ability to map an entire network to a smaller set of IP addresses. Those in the Linux work may know this as IP Masquerading. It allows a simple way to place an entire network behind a firewall, and have all outbound connections appear to come from a single point (or, possibly, a set or points). It can also make it possible for us to transparently proxy certain types of connections. We're going to set up NAT initially on our firewall. Our first configuration will simply map connections from one IP range to another. Then, we will set up the internal FTP proxy, so active mode ftp will work, as well as configure a transparent Squid web proxy.
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