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若留下，须得谨慎言行，不可行那欺男霸女之事。讲述春秋战国时期，吴国灭越，吴王夫差将越王勾践带回吴国为奴。越王勾践不忘国耻，卧薪尝胆，心中装着越国的复兴。在此期间，范蠡等越国将领为复国昼夜奔走，并将西施送给夫差巧施美人计助勾践复国。恩怨、战争与情仇纠缠在一起，演绎出一幕感天动地的历史场景。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).　　《龙战士》是李小龙生时用了多年研究的项目，但最终并没有制作及发表，是他的女儿李香凝在收拾他的遗物时发现大量关系本计划的手稿，后来她在15年联同制片公司向Cinemax销售该计划。Let's take a picture first to see the relationship between these 11 modes:出身香港社会最底层的丁小嘉（佘诗曼 饰）在考上警察后，又以卧底的身份重回鱼龙混杂的砵兰街，替CID督查康道行（欧瑞伟 饰）搜集情报。谁知在追查三合会头目游达富的犯罪事实过程中，道行意外遇害身亡。他在临死前为防止手下卧底人员身份暴露，而删除了包括小嘉在内等五名卧底的纪录。在此之后，道行的同袍刑事情报科总督察卓凯（苗侨伟 饰）联系到小嘉，希望其能协助找到其他四名卧底，并掌握外围赌博集团的犯罪证据。 
　　在此之后，小嘉和赌博集团的得力干将薛家强（林峯 饰）发生交集，更由此陷入警方与犯罪团伙、黑帮组织之间的连番对决和火并之中，由此上演了一段令人拍案叫绝的卧底传奇……2. Second handshake: The server receives SYN message segment. When the server receives the SYN message segment from the client, it needs to confirm the SYN message segment and set the Acknowledge Number to x+1 (Sequence Number+1); At the same time, I also need to send SYN request information, setting SYN position to 1 and Sequence Number to y; The server side puts all the above information into a message segment (i.e. SYN + ACK message segment) and sends it to the client side. At this time, the server enters the SYN_RECV state.