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项梁笑道：先生想必有备而来，不知有何见教？见教不敢当。捉鬼大师杜炎流与金清杰本为夫妻，有一子一女，因两人处世态度和捉鬼方法不同，终导致离婚；但二人仍关心对方，更因两人身边有倾慕者故常借意斗气……二十多万的订阅表明已经有二十多万人付费购买《寻秦记》的收费章节。杨长帆不假思索，在八的位置，又点了一次。这个人是谁？陈某就不多言了，尹将军心知肚明。葛兰与塞特勒夫妻都是研究上古动植物的科学家，他们将全部精力投入到挖掘恐龙骨骼化石上。直到一天，亿万富翁、努布拉岛的主人哈蒙德博士前来请他们“出山”。原来哈蒙德手下的大批科学家利用凝结在琥珀中的史前蚊子体内的恐龙血液提取出恐龙的遗传基因，加以修补和培育繁殖，竟然将已绝迹6500万年的史前庞然大物复生，使整个努布拉岛成为恐龙的乐园，即“侏罗纪公园”。但在哈蒙德带孙子孙女首次游览时，恐龙发威了。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.