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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.黑得理直气壮。《喜新不厌旧》创作人推出全新喜剧《#blackAF》，请到肯亚·贝瑞斯与罗希达·琼斯联袂演出，2020 年 4 月 17 日在 Netflix 上线。汽车世界中，一年一度的活塞杯再次拉开序幕。红色跑车“闪电”麦坤和“冠军”、“路霸”是冠军最有力的竞争者。作为新人，麦坤具有极高的天赋，同时也是一个目空一切的家伙。经过紧张激烈的对抗，这三辆车同时冲过终点线。由于无法判定最终优胜者，组委会决定一个月后在加州洛杉矶召开一次只有这三辆车参加的殊死战，只有最后的胜者才能捧得活塞杯。Star Firefox 2码农大春被父母以死逼婚，又屡遭奇葩相亲对象欺骗，情急之下决定带客户公司正在测试的AI机器人回家假扮女友，谁料机器女友竟是真人来骗钱，性感美女诗诗假扮的机器人演技百变，囧态百出，爆笑连连。而大春与诗诗日久生情，无奈一方因伦理不能爱，另一方因欺骗而愧疚不敢爱，最终结局将如何收场？Related:ABC宣布续订《实习医生格蕾》第16季、第17季。