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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.Tan Weiwei(1) In the most visible place, three vertical ring lights. The top and bottom should be red and the middle one should be white.　　《坦白第一季》为犯罪题材剧集，剧集共6集，保罗·安德鲁·威廉姆斯执导，杰夫·波普编剧。故事聚焦英国威尔特郡，围绕22岁女子希恩·奥卡拉汉失踪案展开。马丁·弗瑞曼在剧中饰演负责此次案件的侦探。本剧将于2019年ITV播出。HBO续订《恶》第五季。本片是《黄飞鸿》的导演徐克和男主角李连杰自《狮王争霸》分手四年后再度合作的作品，由洪金宝掌舵，将中国黄飞鸿故事拉到西方发展，构想与成龙的《我是谁》有点类似。剧情描述黄师父到美国视察牙刷苏所开设的宝芝林分店，但中途发生意外使他失去记忆，忘了自己是谁，一度变成印第安人的勇士，直至十三姨等人在西部小镇与黄飞鸿重逢，才逐渐让他找回自己。本片起用甚多外国演员演出，华工之中则以吴耀汉及老牌粤语片导演龙刚占戏较多，整体说来拍得尚算热闹流畅，李连杰也维持他一贯的漂亮打斗身手，仿佛是为他进军好莱坞而做准备此事之后，梁夕也终于有了一处属于自己的领地——桑曲河。桑曲河位置特殊，处于楚国国境边缘不说，还十分贫瘠，坐落在这里的红薯城饱受各方强盗侵扰，梁夕为了改善红薯城做了各式各样的的努力。在击退了强盗组织红发魔军的进攻之后，为了不坐以待毙，梁夕开始探查在桑曲河的强盗势力的情况，却逐渐发现了七界里流传着的紫薇大帝传说的怪异之处，而这一切又让梁夕有似曾相识的奇妙感觉，让梁夕倍感诧异。