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I have been studying DDOS attacks recently and have read through the book "King of Destruction-DDOS Attacks and Prevention". The book is very detailed about DDOS attack methods and prevention, which is recommended to read, and summarizes the DDOS attack methods in this book.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.一条天桥，架起一条从凡间到天上的路。从这条路上走出的，还有三个孩子飘荡的俗尘里的传奇故事。清末的北京喧闹、纷乱，人们的喜乐哀愁和那时的阳光一样直爽和不加阻拦。在科班中长大的怀玉和好朋友志高就是在这样的阳光下恣意地成长着……杨必归头晕目眩，嘴里尝到了血味，手一抹，尽是鲜血。In order to prepare a zero-based environment, we will empty the rules provided by default in centos6 so that we can carry out experiments and use the iptables-F INPUT command to empty the rules in the INPUT chain of the filter table. Later, we will summarize the relevant commands for clearing the rules separately, and there is no need to struggle with this command here.特七自然是威慑用的，妮哈纯粹是提高逼格用的，身边跟着这样一名西域南洋的仆从，让这些人看到自己与他们有本质的不同。