| 1. | This option provides a basic packet filtering framework
这个选项提供一个基本的信息包过滤框架。 |
| 2. | Figure 1 graphically illustrates this packet filtering process
用图形说明了这个信息包过滤过程。 |
| 3. | The filter table is used for general packet filtering and consists of
Filter表用于一般的信息包过滤，它包含 |
| 4. | Inside the packet filtering tables the rules are grouped together in what are known as
在信息包过滤表中，规则被分组放在我们所谓的 |
| 5. | These three chains are the main chains built - in by default inside basic packet - filtering tables
这三个链是基本信息包过滤表中内置的缺省主链。 |
| 6. | Which facilitates inserting , modifying and removing rules in the packet filtering tables
，它使插入、修改和除去信息包过滤表中的规则变得容易。 |
| 7. | Now all rules in the packet filtering tables are saved in the file iptables - script
现在，信息包过滤表中的所有规则都被保存在文件iptables - script中。 |
| 8. | Packet filtering is fairly effective and transparent to users , but it is difficult to configure
信息包过滤非常有效而且对于用户是透明的，但难以配置。 |
