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Since its basic attack principle is backlog overflow that depends on the end host connection socket, an obvious end host-based solution is to increase the backlog queue size, and this method has been widely used in most servers. Increasing the backlog queue is usually done by modifying the application's listen () function call and an operating system kernel parameter SOMAXCONN, which is used to set the upper limit of backlog that an application can receive. This method itself cannot be completely considered as an effective method to resist SYN flooding, even in some operating systems that can effectively support super large backlog queue allocation, because attackers can arbitrarily generate datagrams much larger than the backlog supported by their operating systems.When the server provides some UDP-based services, such as DNS, SMTP, NTP, etc., and finds some requests, in which the Response message is larger than the Request message, the Attacker sends a Request message that forges the source IP, and the source IP forges the IP address of the victim. After receiving the Request message, the server replies the "enlarged" Response message to the victim, thus realizing the amplification of traffic. The principle is roughly as follows:1934年，美国，一个名叫本·霍金斯的逃犯跟随一个嘉年华队伍旅行。这个嘉年华被一个隐身不露的经理所拥有，在这里有一些怪人———侏儒、玩蛇的女子和占卜师。霍金斯也身怀异能，他可以治好瘸子和唤醒死人。他经常和一个牧师做相同的怪梦，牧师使他相信两人都是上帝意志的体现，他开始施展绝技……少女眉开眼笑，却又泪流满面，显然是喜极而泣，足可见其内心的激动。Public class Invoker {“警察什么的，我要辞职了！”When traveling on icy and muddy roads, the top speed is 30 kilometers per hour.