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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.Example: the flower of Matricariae flos　　本作监督一职将由佐藤顺一担任，曾执导「海物语」及「ARIA」等治愈题材的他，今次执导这种充满智力解谜的作品，对他来说可谓是一个新的挑战，始于风格始终不同，我们也真的不能想像这是一部怎样的作品了。另外，曾为「SKIP BEAT」及「潘多拉之心」等作负责系列构成的关岛真濑，将再一次为这部原创动画给力，关岛真濑一向也有很不错的表现，我们当然也期待着他在本作中同样有出色的表现。说是说，要如何弄清呢？正苦思间，儿子张念祖在外大喊大叫：我要爹。20就读于东都大学数学系的难波胡桃（桥本爱 饰）是一个认为世间万物都可以通过公式和数字找出规律的女孩，在这个浮华的世界里，遨游于数学海洋中的胡桃单纯可爱，完全不知世间险恶。在因扑克赌博欠下300万日元债务的愁人关头，她邂逅了来学校寻访暗号专家森崎教授的初音署刑警伴田龙彦（高良健吾 饰）。伴田精明干练，却总是郁郁不得志。胡桃运用自己出色的数学才能协助伴田解决了天才数学家设下的爆炸迷局。以此为契机，这两个性格别扭的男女在命运的安排下组成搭档，朝着一桩桩高智商犯罪的考验携手冲去……