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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).By the way, how do you know what the PS4 update has updated?Summary Table:大腿上传来一阵刺痛，已经有血液飞溅出来。该剧讲述了肩负守护六界苍生之责的战神九宸（张震 饰）和桃林小仙灵汐（倪妮 饰）相遇相爱，为坚守职责、守护爱人而经历几重辗转悲欢，一诺苍生、挚爱情深的极美神话故事。View Exception Variables Debugged to至于散落的葡萄牙商船，完全用不上杨长帆去处理，海盗们最善于捏这样的软柿子，一些徽王府舰队无暇顾及的地方，也同样遭受了海盗的洗劫。