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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.Only three matches are needed for three people to play round robin matches. There were three rounds, one match in each round, and one person was empty.空军903师是一支有着光荣传统的优秀部队，副师长印双虎（李光洁 饰）飞行技术高超，是师长的有力竞争人选。在与参谋长岳双龙（王斑 饰）的演练对抗中印双虎胜出，但其僚机却遭遇飞鸟撞击事故，在鸟类学家柳琪（黄奕 饰）帮助下，印双虎未受责罚。不久后，岳天龙担任903师师长，印双虎颇为不甘，柳琪亦调入常务连成为空军一份子。印双虎与岳天龙的矛盾因训练理念不同而爆发，熟稔国外空军训练的岳双龙强调实战，而印双虎更尊重前人的摸索经验，二人争执不下，岳天龙随即提出分组对抗，印双虎与岳天龙两位优秀空军指战员展开了一系列伴随着惺惺相惜的对抗与合作……而且，电影还有十几天才会下架，所以最终票房预计最少差不多也有5.5亿。　　金花知道真相，大怒，跟大勇大闹一场，大勇跟着远洋货船出海，想要挣回一笔钱来填补自己的空缺。Figure 2Next, try another method, that is, use the following delegate function to complete the writing of this state machine. This is an example of object-oriented design. The former saves variables as attributes of objects, while the latter encloses variables in the environment formed by closures: