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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).范鄂林冷笑道：罪无可恕又如何？你来执行吗？范文轲嘲讽地看着范依兰，叹道：我的好侄女，不要在执迷不悟了，你的拖延之计失败了……拖延再久，又有什么用呢？范依兰一颗心陡然沉到底，范文轲说的没错，事实上确实如此，单单是靠着自己和这几个人确实难以成事。一位是被成功学洗脑的电商界鸡血创业男，一位是手艺人心态的内向女设计师，当具有神秘力量的666彗星掠过地球时，两人的命运，因一场时尚直播和一场发生在宠物医院的意外交汇在一起。从此以后，两人一旦感到不快乐，行为举止就会变得很像对方的宠物。这份“你中有我，我中有你”的宇宙安排的姻缘，时而是惊喜，时而是困扰，更是成长与爱情的契机。犬系女和猫系男共同经历人生悲喜，也成为了更好的自己。或许，比起666彗星，爱与梦想，才是平凡人生里的最大奇迹。三年前由于刑警刘远文的情报失误，使得其未婚妻、新晋刑警荣钰命丧毒贩伙拼的火场。缉毒大队刑警荣耀由于妹妹之死与好兄弟刘远文反目成仇，刘远文心灰意冷离开警局不知去向，而荣耀则为了报仇，经过三年的不断努力，成为了云港市禁毒大队队长。为了摧毁贩毒K集团并挖出背后国际贩毒组织头目“幽灵”，市公安局抽调资源成立了“84小组”，荣耀为报仇毅然接下组长一职，却不料小组的第一个任务，竟是为“K”集团中仅存的卧底刘远文提供支持，助其上位，接触K组织核心。于是，现实的无情，让背负命运折磨的二人，只能选择再度合作，随着一步步接近真相，二人却发现荣钰也许还活着。回头我跟你云姨捯饬出一个新样子，做给你们姊妹穿了，没准这京城的贵女们就都跟着你们学了。Point Guard