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。

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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）。

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There are some deviations to this rule, and in certain manufacturing plants not all of the code protocol was followed exactly, with every batch of tubes.

也有一些偏离这一规则，在某些生产工厂不是所有的代码协议之后完全的，而每一批的管子。

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