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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).The enemy launched a powerful attack? Counterattack: To attack after evading the enemy's attack. After the successful counterattack, it will become invincible within a certain period of time.We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.Crackle过去宣布预订洛杉矶前副警长Joe Halpin主创兼执笔﹑50 Cent制片的10集新剧《誓言 The Oath》，该剧讲述一个原本以好出发点成立的帮派，但在FBI的追捕下，ysgou.cc他们开始把矛头指向了身边的同伴。Crackle宣布该剧在美国时间明年3月8日上线。Sean Bean饰演警察Tom Hammond，有毅力﹑毫不留情的他是一支由执法成员组成的帮派’ 乌鸦帮/The Ravens’的领袖。Tom某次与卧底FBI探员进行交易，令到他被关进牢狱；当他被释放后，他决心要回到食物链的顶峰，重新掌控这个帮派。但过去曾经是好伙伴的成员，现在却成了他的竞争对象。由Austin Winsberg执笔﹑Richard Shepard执导的NBC音乐剧《佐伊的读心歌单 Zoey’s Extraordinary meiju5.net Playlist》获正式预订，此剧被形容为《偷听女人心 What Women Want》及《爱乐之城 La La Land》 的融合体，剧中讲述聪明但不擅社交﹑典型A型人的快30岁女主Zoey，她某天突然获得以歌曲﹑音乐剧方式听到旁人内心想法的能力，于是她决定以此能力了解及帮助身边的人。曾在ABC喜剧《郊区故事 Suburgatory》主演的Jane Levy饰演女主Zoey。张礼红对自己的生活很自信。事业上，公司刚刚经历失去老总的意外，但在她的努力下，公司业务进展顺畅，她将很可能成为新的总经理。年近三十，收入平平的包子女田一心，最大的梦想就是嫁给未婚夫姜大伟，相夫教子，过平淡幸福的生活。但在结婚前夕，田一心和闺蜜艾玲玲在酒店当场抓到姜大伟出轨，原来姜大伟一直把她当成保姆，背后早就偷偷劈腿。田一心的婚事告吹。为了还婚房的贷款，田一心将房子出租，原本定好的白富美房客竟变成突然出现在她房间的半裸美男赵晓白！ 不仅如此，在不到三天的时间，田一心欠下赵晓白一千零三十万。为了偿还巨额欠款，田一心不得不和赵小白定下契约，答应他的一切无理要求……