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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.芝加哥警署第21辖区分为两个部分，包括直接打击犯罪的行动组和负责调查城市之中犯罪团伙的情报组。汉克（杰森·贝吉 Jason Beghe 饰）是情报组的组长，他嫉恶如仇，将打击犯罪当做自己义不容辞的首要任务，在他英明果断的决策下，许多穷凶极恶的犯罪分子一一落网。马六甲半岛以及南方的瓜哇岛。杨长帆这次却一点也不精明，没了打点的意思。当Mark得知来自医学院的Kit很难接近时，他打算挑战Kit医生。但是，在他与医生见面的第一天，他就陷入了对Kit不利的一面。他一直在追求医生，当他有信心要求Kit成为他的男朋友时，同时发生了一些事情，结果Kit没有接受Mark的爱。所有人都感到失望。问题解决之后，Kit和Mark决定调整他们的理解。Name of Collection: Chinese Baijiaxing Birthday Banknote Collection Book四个美国大男孩吉姆、凯文、芬奇、奥兹即将高中毕业，但四人都还是处男。四人因此遭人嘲笑，他们亦耿耿于怀，发誓在毕业前要告别处男。他们在毕业晚会前就举办了一场派对，企图在派队上找到自己的女孩，告别处男之身。谁知告别处男并没有想象中简单，也没有按设想进行，他们总是在最后关头因为这样那样的原因而失去机会。毕业晚会即将到来，这是他们毕业前的最后一次机会了，四人又开始加紧准备步伐。怀揣着父亲教授的一套性知识的吉姆，最喜欢看图书馆性爱“圣经”的凯 文，最喜欢大龄女人的芬奇，还有多才多艺的奥兹，在这场派队中纷纷为自己的誓言而奋斗，于是有了笑料百出的一幕幕。