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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.香荽又许诺道：你先好好读书。《法律与秩序：组织犯罪》是《法律与秩序：特殊受害者》的衍生剧，主演是曾在1999-2011年于剧集中演出的ChristopherMeloni。ChristopherMeloni会在此衍生剧中再次饰演ElliotStabler，讲述他在纽约警局领导一支反黑组。该剧是讲述钻法律空子的法曹技术者律师遇到事故、进入平行世界后发生的故事。将描写唯我独尊的成功男人改变态度的成长故事。 郑智薰将在剧中饰演李在尚，他是韩国5大律所之一JK律所的精英律师，保持着最高胜诉率，他因为突发事故经历了巨大的变化。小黛丝想着这些，止不住笑容满面，看得乾元殿中上至皇帝，下至太监，都浑身恶寒。可是一来那府邸还在收拾。