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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.　　崔贵华饰演姜浩俊，他是人权促进委员会的总管调查官也是检察厅外派的调查官，是一个集中力极强，以身体支配精神的行动派。周围人都认为他正义感爆棚且冲动，但他其实是一个脑子运转得比身体快的人物。他和冷静的搭档韩允书在性格上刚好互补。2. In the two-person and five-person team formation mode, players can choose to match with strangers to form a team to become a team, or they can open a black match with friends,板栗、小葱就不说了，便是香荽，表面乖巧，其实心里最有主意，更不要说野性的红椒了。故事讲述数学小天才罗克穿越到由数学博士Y统治的数学荒岛，并利用数学知识帮助大家与“黑暗统治”做斗争的故事。《完全婚姻手册》是国内首部以电视剧的形式来诠释现代中国人的婚恋观的电视剧。剧集以不同的家庭为背景，从不同的角度说明要想维持长久的婚姻或幸福的婚姻，只有相互包容，相互谅解，相互支持。