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At present, what methods do we take to solve the attack? The first method shortens the waiting time and deletes the illegal request data packets waiting in the waiting queue as soon as possible. The second method is that the first handshake message is not put into the waiting queue. We return a 32-bit unsigned integer to the client as the Seq of the second handshake. The integer is obtained by adding a serial number of the server to the parameters requested by the user (including the requested address, port, etc.). If it is a normal user, it adds 1 as ACK after receiving this integer and returns it to the server. After receiving the data, the server subtracts 1 from this ACK and then performs inverse operation to obtain various parameters. Finally, the data sent out are compared. If they are completely consistent, it means that it is an effective response and stored in the corresponding data structure, otherwise it is not. Through this method, illegal requests cannot occupy system resources.上世纪20年代旧上海，俨然一个冒险家的乐园。成千上万的人蜂拥至此，只为实现那“一朝富贵，平步青云”的美梦。当然，正引起巨大的诱惑性，各色人等纷繁踏至，鱼龙混杂，好一个混乱喧闹所在。板栗瞄见一名使铜锤的南雀军正追杀秦淼。Now let's make some improvements and go directly to the code:怎么了？还痛是吗？对不起的，是该我不好，昨晚我该多怜惜你才是。两个闺蜜去神庙许愿，愿望居然是想跟男友分手，因为喜欢上闺蜜了？The official website of "De" https://www.kotsu.city.nagoya.jp/jp/pc/ENJOY/TRP0000867.htm