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　　李家是一个普通的传统家庭，老爷子一生追求堂堂正正、是一位退休在家的老车间主任，但他这一生的追求，如今面临的却是儿女无情无意的挑战。老妈更是一位敞敞亮亮，吃苦耐劳，为儿女付出一生的善良母亲。本来好端端的一个家，却被俩个‘不着调’的儿女弄得乌烟瘴气，矛盾重重，新的世界新事多，一大家新的难事儿、怪事儿就少不了，本来老了该歇歇了，应该享得儿女的呵呼，没想到一天到晚却更加手忙脚乱了，刚按倒葫芦又起了瓢。全部心思都用在这上头，所以这味道常年不变。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.罹患怪病的元气少女金小鱼和神秘设计师蒋白驹的命运因一次离奇车祸而改变。一个如流星般绚烂易逝，另一个却在时光里永远暂停，这对恋人该如何把对方留在自己的世界中？紫云乡首富郑维新为大儿子郑天峰筹备婚礼时，新娘子凤儿跟牛儿逃婚了。郑家要将牛儿处以“点天灯”的极刑。凤儿拼死一搏保护牛儿，郑天峰为了保全凤儿性命放过了他俩，并开始了报复。困境中牛儿毅然决然参加了红军。凤儿怀孕了，郑天峰宣告孩子是自己的。他用这种方式逼凤儿回到自己身边，郑维新杀死了牛儿的父母。将凤儿嫁给了花子憨。1. After the preparation bell rings before each subject starts the examination, the examinee will enter the examination room with his ID card and admission ticket, take his seat accordingly, and put the ID card and admission ticket in the upper left corner of the desktop so that the examiners can check them.