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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.樊哙看在眼里，知道项羽是故意为难自己，进来之前张良已经有过交待，屈辱也暂时忍耐心中。“当然是我当哥哥了。”“我才是姐姐，这还用说吗？”什么？吕雉立足未稳，几乎就要晕倒。大雪纷飞，北风呼啸，悍匪五黑刀与日本浪人在一处村落中绞杀的血雨腥风。杨仁、杨运昌和樵夫、拐五爷率领抗匪队夺路救人，尽力保护着村中百姓。杨仁的抗匪队剿灭了五黑刀，赶走了夏山吼，使一方百姓又恢复了往日的平静。然而好景不长，几年之后，新的一轮匪患又悄然兴起，一时间各种势力的角逐再一次打破了百姓生活的安宁，杨氏家族又不同程度的搅入了与土匪的纠缠之中虎踞龙盘。一次突如其来的绑架案把早已随父亲一同收山的杨运昌再一次推向了刀光剑影的江湖之中……包含黑色﹑报仇﹑离婚等题材的《爱芯》讲述30多岁的女主Hazel Green（Cris tin Milioti饰）逃离了丈夫Byron Gogol，因为这个反社会人格的科技界亿万富翁是个渴求关怀﹑不稳定的人，而且他还想在女主脑中植入「Made for Love」晶片，使Byron可以永远追踪﹑观察Hazel，甚至知道女主的一切所想所感。所以Hazel只好不情愿地跑回去沙漠区家乡，与年迈的鳏夫父亲及他的拟真性爱娃娃Diane同住。Printed boards must be dried for a storage period of more than 3 months. The welding conditions are 120 ℃ for 3 hours.