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说是明天就要启程回乡了，忙得很。斗破苍穹第四季拉格纳（Ragnar）和拉格萨（Lagertha）的船队再次出发前往卡塞加特（Kattegat），前往韦塞克斯（Wessex），但这一次他们带来了移民者。 埃伯特国王主持维京人并提出协议。 尽管其他一些领导人心存疑虑，拉格纳尔还是再次带领他的部队参战，但这一次是韦塞克斯的盟友。玉米和花生却告诉他，有什么想要的只管求祖宗，要啥有啥。何况楚汉之间已经和谈。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).