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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.小葱忙嘱咐他小心，莫要被水底的枯枝和老菱角扎了脚。Make practice part of your routine//154根据英国作家珍妮弗·沃斯的畅销回忆录改编，讲述上世纪五六十年代伦敦东区一群助产士的生活经历。本季故事承接2017年圣诞特辑，从1963年年初讲起，大雪给助产士们的工作和生活造成了诸多不便，Nonnatus House迎来一位新护士……他也意识到失言，忙闭上嘴。(3) There are eleven behavioral patterns: policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern.