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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).So it is impossible to match the case, so the result is? Do not know村里其他人家不也送了？这都是你爹娘善心有好报。等下到了前面，有一棵棠棣树。杨必归扑向杨长贵的怀抱，杨长帆一把将其抱起大笑道：好孩子，爹欠你的，后面都会补回来。爱奇艺与邵氏影业首次合作。国内首次以“保险理赔员”为视角，追查保险事故真相，集动作烧脑、悬疑推理于一身的虐心而又温情的行业故事。若是共尉以一个朋友的身份来请他帮忙，他或许会考虑予以帮助的，但是共尉似乎忘记了这一点，完全就是功力的拉拢，威逼。