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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.武当掌门无尘子（朱铁和）命两大弟子傅青云（刘德华）和慕容白（吴启华）消灭魔域，二人几经波折，终潜入魔域，却发现魔域原是世外桃源。云对魔域生活渐生好感，更爱上魔域首领傅千山（石坚）的义女唐琪（赵雅芝）；白则继续从中挑拨，令魔域中人自相残杀。云望尘能收回承命，不料却遭到利用，误伤山，正派人士遂将魔域一举歼灭。 　　云往武当山，适白为争掌门之位与尘恶斗，遂出手助白，令尘重伤。尘临终前道出云实为山之子，云闻讯晴天霹雳。 　　云逃返魔域，眼见昔日乐土已成废墟，决意学习魔教武功，重建魔域。一日，白忽至，欲杀云，幸琪及时赶至力退白，千钧一发间，山被白重创，山死前嘱咐琪助云光复魔域。白眼见云势力日大，不惜出卖爱侣楚烟寒（周秀兰）以换来绝世武功，与云一决死战，并要血洗魔域……你敢过来，胡大爷剁了你。人死债清，再大的恩怨，当事者一死，这事基本上也就过去了。Shandong Province　　故事仍然发生在汉东省京州市，时间为《人民的名义》反腐风暴半年后：京州一家有着八十年壮阔历史的大型国企中福集团在转型期陷入困境，其中既有市场变化的因素，也有不可忽视的严峻的腐败问题。一场意外的爆炸，炸出了五亿资金的离奇失踪，将各种尖锐复杂性的矛盾逐步暴露出来。党政高官、企业高管、社会各界、底层弱势群体，各类栩栩如生的人物——你方唱罢我登场，故事惊心动魄……/raise (raise your hand)