TCP 会话重组研究.TCP 是一种面向连接的协议，客户与服务器之间的任何一次会话都必须建立连接[1]，退出会话时必须断开连接。连接的时候需要3 个报文，断开的时候需要4 个报文。-Reengineering a TCP session. TCP is a connection-oriented protocol, any one session between the client and server must establish a connection [1], when you exit the session must be disconnected. Need 3 connections message, need 4 disconnect message.