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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.匈奴在越军的追击之下，一再溃败，几乎被吓破了胆子。Magic Attack Bead小学校长陈绍常妻子早逝，辛苦地将三个孩子拉扯大。朋友刘之权逝世，其女刘敏华不堪后母虐待找绍常谋事，绍常将她留在学校做了一名教员。长子建中在银行工作，与经理的女儿结了婚，为了自己的名声他劝父亲从小学校辞职。绍常无奈提出辞呈，推荐敏华为校长。因过不惯无所事事的日子，绍常内心十分苦闷，在敏华的邀请下，他又回校做教员。一名同事托绍常向敏华求婚，绍常才发现自己已经爱上了敏华，而敏华也深爱着自己。不顾重重反对，绍常与敏华勇敢地结合了。花开了！你还在！如果，青春可以重来，也许，只是也许~~~电影讲述了一个秦朝将军被秦始皇派出寻找拥有三颗痣的“私生公主”，为了保证“公主”的贞洁 ，临行前将其阉割成太监。将军穿越到现代，解救了正遭到老司机强暴的医学院校花小雅，小雅对其一见钟情，又因为每次XX都无比尴尬，于是两人一起想恢复“根子”，却发现，所有的一切都是一场早已布局的阴谋.........