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这是一个关于沙滩少男少女的蓝色青春故事。却被一人上前阻止了。父亲，依我看，还该再等等。余宝（郑中基 饰）的家姐余珠（吴君如 饰）性格强势，事业成功，著有多部宣传单身主义的畅销书。余珠的未嫁令弟弟颇为困扰，因为很据极为灵验的家训，余宝无法在姐姐成婚前确定自己的终身大事。经体会到爱情“天旋地转”之感的公司阿姨介绍，余宝请动爱情治疗师曹迪克（古天乐 饰）出面，帮助姐姐打开封闭的心锁。曹迪克成功接近余珠，并使其陷入了旋转的恋爱感觉。然而在曹迪克和余宝的一次千岛湖之行中，两人结识了豪放热情的龅牙珍（姚晨 饰）和温柔可爱的小敏（沈丽君 饰），并双双沉入爱河。与此同时，纠结难耐的余珠前往杭州探视曹迪克，在私家侦探柯男（黄百鸣 饰）的陪同下发现了事情的真相。不过幸运的是，每个人最终都找到了自己爱情的归宿……李哥，你看了《白发魔女传》？……没有？那你现在快按到江南卫视，不好看，你砍死我。When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.