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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.John must make a choice at the train platform - be free from his obligations and adversaries by letting Agathe take the money or pursue her, at great risk to himself, in an effort to protect his brother, father, and country. Meanwhile, his father presents a perilous way out of it all: find and assassinate Cantar Walley in Paris.CBS续订剧集FBI第二季《联邦调查局》顾名思义就是讲述美国著名的执法部门FBI，而该剧背景在纽 约的办公室。According to the data released so far, although enterprises have put in more than 10 million green express boxes, such green express boxes are still unfamiliar to many consumers.Netfilx宣布将为月初被砍的《超感猎杀》制作两小时最终篇！Wolfgang的命运及更多大坑终于要填上啦！剧集制作人拉娜·沃卓斯基在致Sense8家族的一封信中感谢全球粉丝，表示大结局正在制作中，将于明年上线！23