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郑氏闲闲地笑道：这一碗汤，可不便宜。徐文长不知道该怎么回答，但他应该是很不好的。青山等人听了愕然，不明白这话是什么意思。毕比国王探索本杰明·内塔尼亚胡的崛起，仅仅依靠他多年来媒体表演的档案镜头：从他在美国电视台担任受欢迎嘉宾专家的日子，到他公开承认通奸，以及他对社交媒体艺术的掌握。从一个演播室到另一个演播室，“比比”从以色列巨大的政治希望演变成一个有争议的人物，有人认为他是以色列的救世主，也有人认为他是一个愤世嫉俗的政治家，为了保住自己的权力，他什么也不做。从小袋鼠到神奇狐蝠，从剧毒蛇蝎到杀人机器澳洲鳄鱼，《澳洲荒野秘闻》带领观众深入澳大利亚，揭秘澳洲最具代表性的野生动物，了解这些非凡生物何以在这个令人叹为观止的神奇大陆上茁壮成长。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.