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The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.带着野菜的香气，吃完还满口余香。Figure 2黄豆忙道：就费这一样，也不算啥。He Yihe especially likes a statement made by Tang Wang, a Mexican witch doctor, "Everyone has a god of death, right behind his left shoulder. When I don't realize something, look back and ask, 'What do you think, man'. Remind me of the fact that I will die all the time so as to lead a meaningful life."柜台小姐看了陈启几眼后，便拨通桌子上的电话。看来真的是老天眷顾啊，陈平到来对自己而言，无疑是如虎添翼，很多发愁的事情也都能迎刃而解了。