流行的做法是实行安全闸，这种方法可以做到安全有效的单向数据传输，但是安全成本太高，硬件价格昂贵。

The prevalent method is to implement the safe floodgate, the safe and effective one-way data transmission method, but the safe cost is too high and the hardware costs too expensive.

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如果您要测试用于传送封包的路由器和闸道器之传输单元最大值(MTU)，则这个选项将会很有用。

This option is useful if you want to test the maximum transmission unit (MTU) of the routers and gateways used to transmit the packet.

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