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Still use the-I option to insert rules,-I INPUT 2 means to add rules in the INPUT chain, and the number of the added rules is 2. OK, try it yourself.3. Humanized operation and use玉米大喊道：苞谷，你瞧这是啥？苞谷顺着他手指的方向往前看。Regarding the network charges, the three major operators have not made clear publicity at present.于是杨长帆向全军宣布，为了犒赏大军墨西哥作战的勇猛与无私，他将带领大家寻找取之不尽的金子。　　莲花已成了艳翠楼名妓。刘学栋借口到上海了解土特产行情实为斗蛐蛐。上海斧头帮头目刘七心狠手毒，借斗蛐蛐之名聚敛银元。刘学栋同他打了几次交道，震慑了刘七，刘七佩服他是条汉子，隧成了朋友，并帮他做成了生意。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.