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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.It is rare for on-the-job prosecutors to report sexual harassment by their superiors under their real names in the hierarchical South Korean judiciary, and the author of this post is the victim's own prosecutor Xu Zhixian of Changyuan Inspection Office.一阵狗叫人喊，板栗他们冲进桃花谷，纵马驰入素装披裹的桃林深处，远远看见半山腰那宅子透出朦胧光晕，二楼上挂着一排红灯笼，依稀见得人影憧憧。所以陈启决定再次连载小说。此剧讲述一个有着无穷母爱的女人，克服了试炼和伤痛后寻求幸福的故事。葫芦沉脸道：青莲，甭闹了。童善是一名清官，担任总理衙门督办，他带着一家老小在振武堂总镖师柳云天的护送下从回疆返京，途中遇抢匪胡笑天率众抢劫，慌乱中，除四子童玉官外，其它三子均不知去向，童家四子各自拥有四分之一扇形玉佩，成为童家四子日后相认的唯一信物……