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The Book of PF by Peter N.M. Hansteen

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Chapter 3. INTO THE REAL WORLD

INTO THE REAL WORLD

In the previous chapter we demonstrated the configuration for basic packet filtering on a single machine. In this chapter we'll build on that basic setup but move into more conventional territory: the packet-filtering gateway. While most of the items in this chapter are potentially useful in a single-machine setup, our main focus now is to set up a gateway that handles common network services.

A Simple Gateway, NAT If You Need It

At this point we will start building what you probably associate with the term firewall: a machine that acts as a gateway for at least one other machine. In addition to forwarding packets between ...

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