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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).宿舍中，吕馨眼睛看着电脑屏幕，十指闪动，不停的敲击键盘，随口说道：什么事？一惊一乍的。叫白果的女孩应了一声，起身跟在那小姐身后，随着鲁三和胖子往前边去了。讲述一对夫妻因其幼小的孩子死去，十分伤心，婚姻也出现裂痕，妻子把一个假娃娃养在家里，还请了保姆，家中却发生了神秘的事：找来的小保姆也把这个孩子当成活的婴儿一般对待，更多怪事发生……到底该信故事的哪一个版本？王尚书追问：那你是认罪了，自承就是背后主谋？白凡摇头道：下官只是对找到假玉米的巧合无话可说。