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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).他正了正身子，轻咳一声道：想必诸位都已经清楚，之前朕因为不了解内情。Online work class refers to a teaching scene in which real teachers teach online, which includes live online teaching and recorded video teaching. In the first half of this year alone, six online children's thinking ability training companies received financing, with a total amount of more than 600 million yuan.　　还是在这一年，整个中原武林进入了最动荡的时节。大任The attack power of the weapon is based on the panel attack power.Lins Concubine 12谢谢所有支持《回家》的兄弟姐妹。