Iptables Tutorial 1.2.2

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Chapter 9. How a rule is built

This chapter and the upcoming three chapters will discuss at length how to build your own rules. A rule could be described as the directions the firewall will adhere to when blocking or permitting different connections and packets in a specific chain. Each line you write that's inserted in a chain should be considered a rule. We will also discuss the basic matches that are available, and how to use them, as well as the different targets and how we can construct new targets of our own (i.e.,new sub chains).

This chapter will deal with the raw basics of how a rule is created and how you write it and enter it so that it will be accepted by the userspace program iptables, the different tables, as well as the commands that you can issue to iptables. After that we will in the next chapter look at all the matches that are available to iptables, and then get more into detail of each type of target and jump.


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