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Using the V3’s Advanced Firewall
This chapter describes the V3’s advanced firewall and the types of protection it offers. If you are like most users, you probably will not need to modify your firewall settings. If, however, you are an administrator or an expert user who wants to customize the firewall to protect a network against specific threats, you should refer to this chapter.
You can think of the firewall as playing a role like that of a guard at the gate of an ancient walled city. The guard has a great scroll, which lists allowed and proscribed traffic. In one possible set of rules, visitors may enter only if they show an invitation from a citizen of the city. Children may not leave the city. The guard may allow entry of carts of flour, but only for delivery to the bakery. Any messenger who doesn’t know the password to the city is thrown in the moat, and can’t pass through the gate.
You may set the policies of your firewall, which is like writing the rules on the great scroll in the example. The firewall will then follow the rules, acting like the guard. Instead of controlling entry and exit of goods and people, you control entry and exit of particular types of IP packets. In general, you will want to do this to prevent unwanted packets from entering your network (this is the purpose of the wall in the first place).
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