For each rule, you specify a protocol, a range of ports, and a range of IP addresses allowed to access those ports via that protocol.
对于每个规则，您要指定一个协议、一个端口范围以及允许通过那个协议访问那些端口的一个IP地址范围。
The optional match section of the iptables command specifies the characteristics that a packet should have to match the rule, such as source and destination address, protocol, etc.
iptables 命令的可选 match 部分指定信息包与规则匹配所应具有的特征（如源和目的地地址、协议等）。
The compliance mechanism of Kyoto Protocol is composed of three parts, the primary rule system, the compliance information system and the non-compliance response system.
《京都议定书》遵约机制的主要内容包括基本规则体系、遵约信息体系和不遵约反应体系三部分。
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