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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.The 50,000-yuan Arrow Factory video told it a series of videos (producer Wang Shaojun, Guo Rongfei, host Li Dongling, photographer Lan Danqing, edited Wu Lanruo)《灰姑娘的姐姐》一剧以童话故事《灰姑娘》为主干，但主角则换成灰姑娘的其中一个恶女姐姐。讲述了充满仇恨的灰姑娘向继母和姐姐们报仇的故事，文根英在这部《灰姑娘的姐姐》中将饰演欺负灰姑娘的姐姐角色，这是文根英出道至今首次诠释反面角色。网络短剧《人鱼王子》讲述了因为去江原道毕业旅行的惠利和充满谜团的佑赫相遇而展开的推理幻想罗曼史。她制定了标题为他在等我让他回来的计划,她暗恋的人将在46天后结婚,需要他在此之前爱上她。她最好的朋友Khanittha伸出援手。蹲在那墩子上，托着下巴望着屋顶想主意。　From The Pen Of Legendary Crime Writer Lynda La Plante Comes A Brand New Drama - Above Suspicion. Kelly Reilly Stars As Anna Travis, A Rookie Detective On The Hunt For A Serial Killer Alongside Her Tough Boss DS Langton (Ciaran Hinds)