因为程序是利用protent结构指针指向当前所在协议层的方法来实现的因此，每一层都要经历几个阶段，直到本层达到OPENED状态时才可进入下一阶段来实现下一阶段的协议。所以对每一层的协议都有相同的函数指针，只是函数指针指向的协议不同而已。

Packet : PPP程序基本流程.doc filelist

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