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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.吴芮道：如果你姐夫有心，他会想办法送你姐姐和孩子来衡山国的……可是这一路很不太平，他们未必能够顺利进入衡山境内……吴芮沉默片刻道：那好，你率领一支人马前往边境去想办法营救你姐姐。三姐姐，我劝你老老实实跟爷爷说实话吧，你不是一向最大方磊落的么，就算这次来书院，也是经爹娘允许的。西安事变前夕，红军到达陕北，蒋介石欲将西安作为陪都考虑，西安一时成为全国的焦点城市，是中统、军统、中共、日本人、中央军、东北军、西北军各方情报特工人员争夺的前沿。为夺取解放胜利，共产党地下人员武仲明以孪生哥哥武伯英身份潜入西安。 武仲明刚到西安，便面临一场生死考验。办公室的新派女性黄秀玉对其疯狂示爱。而一直追求黄秀玉的特务科长胡汉良处处为难武仲明。更令武仲明意想不到的是，已经与哥哥离异的嫂子沈兰，竟然回到西安寻夫。特务头子齐北以联络官的身份赴西安党调处就职。危急关头，武仲明在沈兰和组织的帮助下，将危险一一化解，送出情报。　　葵饰演的真帆是以父母离婚为契机，与友梨搬到同一个住宅区，开始憧憬都市长大的友梨，吉川饰演的是因为被知道虐待而与友梨疏远，从恶劣的家庭环境变成不良少女的里子。