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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).老弟恭喜了。龙颜震怒之下，也不提拔了，令押解张杨及岷州巡抚等一干大小官员进京问罪，一面另派遣文武官员去西南应对。虽然恨极，然不得不承认，这辈子除了妻子，他还真没爱过别的女子，可是她却从背后捅了他一刀……如今，更是父子分离几十年不得见面——岷州到湖州再远，也远不过他们父子之间的鸿沟。讲述了藏族青年闹日昂杰毕业之后的两年时间都过着没有工作闲赋在家的生活。家人希望他考个稳定的工作，但生在草原的闹日不喜放牧，热爱自由更爱骑行。为了参加甘南藏地传奇国际自行车大赛，他背着家人刻苦训练，还遇到了他喜欢的姑娘——嘉嘉。在嘉嘉以及她哥哥大伟的帮助下，以及闹日昂杰的顽强的意志，最终在自行车大赛中获得了冠军。夏天天刚把校霸郭之宇调教成“忠犬”男友，就遭到了母亲何青柠的强烈反对，在何青柠心中，夏天天的公司总裁秦至才是完美女婿，她决心要亲自出手，却没料到，偶然的一天母女二人居然互换了身体！何青柠开始顶着女儿的身体为所欲为，夏天天则用母亲的身体奋起反击，俩人在鸡飞狗跳的互换人生中慢慢理解彼此。与此同时，两段高甜恋爱也正酝酿发酵......本剧故事设定在英格兰布里斯托尔。Sharp饰演警探Hannah Laing ，她发现自己的儿子在一桩凶残谋杀案的调查行动中，作为卧底线人扮演着至关重要的角色，因此变得十分矛盾。 Gibson饰演她浑浑噩噩的儿子Christian。Gojanović饰演Davor Mimica，犯罪团伙头目。Regan饰演不走寻常路的调查员Billy Murdoch，临时被调派到Hannah的小队，在东欧贩毒集团相关问题上提供建议。