The Rulebase
In order to determine who can do what, you must create rules. The rules are created in terms of objects and services as defined in the previous section. Rules should be listed in the order you want them enforced. In the following subsections, I discuss the actual order in which rules are applied, but for the sake of discussion at this point, let's assume they will be enforced in the order shown in the rulebase.
The Parts of a Rule
Each rule has several elements. In many cases in this book, I will not show all the elements because they are not always relevant. However, in this section, I discuss all of them.
Source and Destination
In the Source and Destination parts of the rule, you input the hosts that will be allowed to originate ...
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