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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.《筑梦情缘》电视剧是由霍建华、杨幂领衔主演，曾江特别出演，冯雷、姜宏波、张峻宁、葛施敏、章申、曲高位、王骁、许榕真、张帆、张衣、张淞等主演的年代励志剧，该剧讲述了以沈其南和傅函君为代表的中国优秀建筑行业筑梦者坚守“以人为本”的设计理念，将中华优秀传统文化精髓运用到建筑设计和建造领域的故事.来港奔丧的高大喜（黎耀祥 饰）经父亲好友推荐进入警队工作，再一次抓赌行动中一颗子弹贯穿大喜头颅，脑细胞被激活进化，他变身智商超人，成了无案不破的神探高伦布。但同时他的情商管理区却逐渐缩小，性情发生了严重变化。在市民眼中他是神探，在匪徒眼里他是克星，但在警队同事眼里，他是一个不近人情的冷血动物。保安司金路易（Joe Junior 饰）急招刚从苏格兰场毕业的女儿金伊娃（马赛 饰）回港，并安排警员蔡飞龙（萧正楠 饰）当其助手，日夜监视大喜行踪。大喜略施小计赢得伊娃芳心，但伊娃同时也对业务出色的飞龙产生仰慕，一时陷入两难之中。当年与大喜悔婚的梅妹（唐诗咏 饰）赴港寻女，得知大喜未婚，决定与他再续前缘......上世纪二十至四十年代的中国，那是一个民气十足、海阔天空的时代，一群年轻人经历了一段放任自流的时光，自由地追求梦想与爱情，有人在流离中刻骨求爱，有人在抗争中企盼家国未来……萧红，一个特立独行的女子，一路流亡，从北方到南方，从哈尔滨到香港，一边躲避战乱，一边经历着令人唏嘘又痛彻心扉的爱情与人生。对生的坚强对死的挣扎在她笔下穿透纸背，她的人生亦是如此。在防备松懈的情况下，突然袭击拿下了临淄城南门。