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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.网剧《你在我的右手边》是一部青春、励志、喜剧校园剧。该剧以青春为主线，主要讲述了单求胥（男一）与王元鹅（女一）的极品同桌的爱恨交织，矛盾纠结的校园故事。观众将会通过观剧形式，联想到自己的高中时代，怀念曾经历过的美好青春岁月。1992年，少女桑迪·坦和她的朋友苏菲和茉莉拍摄了新加坡的第一部独立电影《逃避者》，与他们神秘的美国导师乔治·卡多纳一起。萨迪写了剧本，并扮演了主角，一个名叫s的杀手。在拍摄结束后，乔治斯消失了所有的镜头！20年后，16mm的罐子在新奥尔良被发现，送出了桑迪，现在是洛杉矶的一个小说家，在两个大陆和许多媒体上的一个新的个人奥德赛上：16mm，数字，Hi8，超8，幻灯片，动画和手写信件。一个千变万化的朋克摇滚鬼故事！‘男女授受不亲乃礼之大防，然医者父母心，行的是治病救人的善事，自然另当别论。本剧以沈阳慕马案为原型，把慕绥新、马向东从发迹到走向毁灭的过程加以艺术再现。在跌宕起伏、悬念重重的剧情中，人大主任在市委坚定有力的支持下，运用国家和人民赋予的神圣权力，一一挫败市长的种种阴谋，最终正义战胜邪恶，激浊扬清，惩治腐败！Wobany introduces several classic methods here to detect the advantages and disadvantages of network cables.