Basic filter rules 基本过滤规则
This firewall uses the Packet Filter technology, but it make some improvement over the coventional Packet Filter technology. In the Filter rules, the rule based Keyword in the Packets and the rule base TCP connection Stateful Inspect is added.
该防火墙使用了包过滤技术，但是在传统的包过滤技术上作了较大的改进，在包过滤的规则中加入了关键字过滤规则以及基于对TCP连接状态进行监测的动态过滤规则。
参考来源 - 基于Linux的以太网综合型主机防火墙的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
Chfilt: Used to change existing filter rules.
chfilt：用来改变现有的过滤规则。
Iptables are used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel.
iptables用于建立、维护和检查Linux内核中的ip数据包过滤器规则表。
Specifies that documents which have not been either passed or blocked by the filter rules above will be passed.
除未通过和被阻止的网页，其余网页根据规则将可以访问。
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