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This is original method!　　—Sarah Moore Grimké, activist for women’s suffrage, 1837汉军将咸阳城受到严密，就连排水沟这些地方都小心防备，可以说是铁桶一般。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.Fourth: We must pay attention to the cost of icebergs when spending money.求与获得，幻灭与希望，情爱与仇恨，真诚与欺骗，善良与邪恶，这些对立的矛盾在马八一、王长贵、杨五月和林红缨四个主人公之间缠裹着，纠葛着，伴着他们的成熟成长，几近二十年。3.1 Create syntax as follows