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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.21The function of weightlifting belt to reduce the pressure on the back under the weight lifting in the straight force position is realized by compressing the contents of abdominal cavity. Compressing the contents of the abdominal cavity can increase the intra-abdominal pressure (IAP), increase the anterior support of the lower back vertebra,这一部小说感动过很多人，陈启当初看的时候，也被感动过，即使现在再看一遍，依然会感动。讲述一对男女被初恋满满占据了记忆，内心留下了无法愈合的伤口，每天都过着痛苦生活的故事。朴有天将饰演有著开朗性格，有些厚脸皮的韩正宇，是个心里怀著对心爱女人的思念，像猛兽般追捕犯人的角色。尹恩惠则饰演从小背负着父亲带来的黑暗童年和罪名“杀人犯的女儿—李秀妍”，和母亲相依为命。15岁时，有着和韩正宇快乐并且苦涩的初恋。长大成为服装设计师后，内心充满了初恋的记忆，并且留下了无法愈合的伤口。Host Firewall: Protect against a single host.大苞谷道：咱们先不声张，他们知道我们是干什么的？等样样都安排妥当了，再把真相掀开。