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并不是害怕被人说，就是……就是觉得，好没意思。In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).Move讲述了10年间无法忘记初恋的主人公穿越时空回到了10年前，和初恋之间荒唐的三角关系的故事。一场紧张、刺激、惊险的战斗即将开始，天狼星人能否在地球少年的帮助下打败邪恶外星势力并重返天狼星？“天狼号”的超级能源成长后会有什么样炫酷的变化？AOP programming