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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).二水奈何不得兰芝，忽然想起自己曾经丢下的女儿丫丫，就去找绿叶要回女儿，绿叶坚决不答应，二水就跑到绿叶娘家和婆家去闹事。Of all American journalists, I think the most outstanding one is Haret Aban of the New York Times. Due to Aban's years of experience in China, his rather sophisticated treatment of people and his reputation as a Times, he has made quite a wide range of friends. He and Chiang Kai-shek's wife Song Meiling are also very close friends. He doesn't have to be like me. As a reporter of the Japanese News Agency, he has to be busy with the morning and evening reports every day. He just needs to pick up some important information and transmit it. So he is in an extremely advantageous position. Although I am in Shanghai, I have always been concerned about the U.S. Policy towards Japan and developments towards China, so I often exchange views and intelligence with Aban.A year after a devastating flood has killed five locals in an idyllic country town, a mysterious new plant appears. The plant's phenomenal ability to restore youth is so formidable that attempting to harness it means re-evaluating values.Sailboat该剧是讲述在聚光灯背后操纵这个世界的真实政治玩家们的危险赌局，将描写指向权力顶点的超级辅佐官张泰俊的炙热的生存故事。 　　李政宰饰演张泰俊，他是4选议员的首席辅佐官，他以第一名成绩毕业于警队，曾活跃在搜查前线，但为了拥有更大的权力而进入国会，是一个把不可能变成可能的超级能力者。他有着出众的直觉和冷静的判断力，自在地游走在边界线上，以偏执的胜负欲把自己辅佐的议员推到党内代表的位置上。但他并不满足于现状，指向权力顶点的更大的执念隐藏在他柔和的笑容下。 　　申敏儿饰演女政治家姜善英，她当选了比例选区的议员，并成为所属党派的发言人。