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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.故事发生在清朝末年的江南古镇——南溪。钮世诠（王冰 饰）是南溪的首富，一心想创办中国首家机器丝厂，女儿钮方丽（杨恭如 饰）海外学成归来，在上海火车站目睹了宋教仁被谋杀，混乱中她与齐彻（黄觉 饰）邂逅并相恋。不料俩人的恋情遭胡家强烈反对，因胡家长女胡碧容嫁到钮家后，从十六岁守寡，如今已整整三十年，而当齐彻明白自己爱上的竟是仇家的女儿后，更是心绪难平。此时齐彻的弟弟肖晃（廖凡 饰）又爱上了方丽的妹妹曼蝉（李小璐 饰），但因错走一步路，陷入万劫不复深渊。钮世诠欲置齐彻兄弟于死地，不成想自已则被对他恨之入骨的胡碧容杀死。之后，肖晃与曼蝉绝迹江湖，碧容因与家奴偷情东窗事发自焚，两代家仇从此灰飞烟灭......宴席已毕，眼看就要催促发嫁了，众人都着急：就这么放白虎将军走了？他们不能闹，有人能闹啊。影片以一块价值百万的昂贵怀表为线索，农田中“不务正业”的武痴小伙石头，为向村民证明自己是全村人的希望，担起进城送表的重任，踏上了一条囧况不断的送表之路：途中不仅有美女出卖色相偷怀表，更有地头蛇威逼利诱...怎么会这样？龙且突然之间想到了最近积雪融化，河流之中水流应该充沛才是。备考……徐文长闻言还真有几分动容，何府的确清静。