Now you've learned how to build basic rules and chains and how to add or remove them from the packet filtering tables.
现在，您已经学习了如何建立基本的规则和链以及如何从信息包过滤表中添加或删除它们。
After the rules are built and chains are in place, the real work of packet filtering starts.
建立规则并将链放在适当的位置之后，就可以开始进行真正的信息包过滤工作了。
A table is a packet filtering table that contains rules and chains dealing with specific kinds of packets only.
表是包含仅处理特定类型信息包的规则和链的信息包过滤表。
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