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板栗和魏铁又喝了一碗豆腐花。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 policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:可是，原野能不能先欠着呢？没有存稿了，又在酝酿下一波**，所以需要缓一缓，到时候再来三更五更地归还。患有男性恐惧症的宅腐女费菲与中二妖孽男海洋开始了一段“同居”生活。性格迥异的两人矛盾不断，生活变得鸡飞狗跳。而郑尔岚因为嫉妒璟顼对费菲的与众不同，开始利用职务之便不断找茬，这让费菲要出版图书成为畅销书作家的梦想不断受挫，而海洋的中二病也让他在Cosplay大赛中屡屡遇到挫折。在这最艰难的时期，原本吵闹不断的两人却成了彼此最坚实的依靠，相互鼓励走出困境。朝夕相处中，费菲渐渐发现海洋的奇怪之处，细细探究之下却发现海洋是从她的一本小说中穿越而来要给自己改写命运的炮灰男三号。乔相宜与因为一夜情而成为夫妻的总裁晏词在离婚的过程中相互较劲，渐渐理解并相爱上了对方。故事以位于关东的某所小学为舞台，主要描写以该学校的6年2班中的CP——绫濑花日和高尾优斗、苍井结衣和桧山一翔的学校生活为中心展开的只属于12岁的淡淡的恋情与友情。