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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.Dioscorea cirrhosa root slice唐中晚期，来自西南山区仵作世家的少女楚楚，为实现当仵作的梦想独自来长安闯荡，参加仵作考试，遇到断案如神的安郡王萧瑾瑜。萧瑾瑜招收楚楚作为仵作搭档揭秘探案。楚楚的身世之谜一石激起千层浪，打破了京中多方势力平衡，一场明争暗斗的权力斗争随之展开。伴随着一个个的案件破解，楚楚和王爷等人组成的团队一步步揭开谜底最终破解了一场延续18年的惊天大案。萧瑾瑜和楚楚顺利成婚，而楚楚也获皇帝的最终认可，得到了皇帝亲赐的 “御赐仵作”身份，实现了自己的人生理想。JulienBaptise刚刚经历了可怕的个人悲剧,他寻找可以让自己分心的事情,因此被引向了英国大使EmmaChambers（FionaShaw）,她的家人在匈牙利山区滑雪度假时失踪了。正在此时，卫兵来报有百多人出现在营地外，求见沛公。The landlord here. . . Yes, for a long time.