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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).清末，英、法、俄等八国强硬侵压中国，日本亦对中国侵略不断。天津霍元甲生于武术世家，小时患有喘病，父拒授他武功，但志存高远的他，暗地里练得一身好功夫！布拉德利·弗里加德（BradleyFreegard）饰演埃文·豪威尔斯（EvanHowells），马克·刘易斯·琼斯（MarkLewisJones）饰演史蒂夫·巴尔迪尼（SteveBaldini），奥利维尔（Olivier）获奖的西莉亚·伊姆里（CeliaImrie）（维多利亚·伍德（VictoriaWood）：电视上的《餐厅》（Dinnerladies），最佳异国情调万寿菊。这时，一个偏将从后边跑过来，低声在老将军耳边说了几句，何霆当即大怒：同袍间比试较量，却下如此狠手，怎配为将？传令，革去黎章队长职务，降为普通军士。First Certificate of "Newly Established" Wuxi Enterprise: Free; The second card starts with one household and has more than one card: 200 yuan/card/first year (including media); Foreign enterprise certificate: 200 yuan/sheet/first year (including media)