Ethernet packet headers, including the Ethernet source and destination address, packet size and the Ethernet packet type.
Ethernet数据包头，包括Ethernet来源和目标地址，数据包大小和Ethernet数据包类型。
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）。
As packets arrive, they are filtered by their type, source address, destination address, and port information contained in each packet.
当信息包到达时，根据每个信息包中包含的类型、源地址、目的地址和端口信息来过滤它们。
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