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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).Two, civil aviation pilot level:Representative Monsters: Low, Medium and Advanced Light Elves, Sniper Trick, Mognes, etc.尹旭不时的挥手致意，展现亲民形象，不管怎么说番邑都是东来的故乡，也是自己到来之后最早生活的地方，在这里尹旭有种天然的亲切感。莲花岛，它是整个苏南农村的一个缩影。它的发展轨迹在当今的苏南地区具有典型意义。The armor value after turning on the Warrior Prophet Incarnation 150% and stacking 5 layers of Flame Chop alert 25% is the initial armor value * (1 + peak 25% armor bonus + Prophet Incarnation 150% + Flame Chop 25%).