The pipe chains commands in sequence, where the output of an earlier command becomes the input of a subsequent command.
管道按次序把命令连接起来，前一个命令的输出作为后一个命令的输入。
The filter table is used for general packet filtering and consists of INPUT, OUTPUT, and FORWARD chains.
filter表用于一般的信息包过滤，它包含INPUT、OUTPUT和forward链。
The filter table is used for general packet filtering and consists of INPUT, OUTPUT, and FORWARD chains.
filter表用于一般的信息包过滤，它包含INPUT、OUTPUT和forward链。
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