The nat table is used for packets to be forwarded and consists of PREROUTING, OUTPUT, and POSTROUTING chains.

nat 表用于要转发的信息包，它包含 PREROUTING 、 OUTPUT 和 POSTROUTING 链。

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There are many other chain types available like PREROUTING and POSTROUTING and there is also provision for user-defined chains.

另外，还有其它许多可用的链的类型（如 PREROUTING 和 POSTROUTING ）， 以及提供用户定义的链。

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