Technology of StatefulInspection is mainly checking a part of stateful flag of IP step or TCP step, and decide whether let a data packet pass.
状态检测技术主要是通过对IP层或TCP层的部分状态标志进行检测,来决定是拒绝还是允许数据包通过。
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Statefulinspection: a newer method that doesn't examine the contents of each packet but instead compares certain key parts of the packet to a database of trusted information.