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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.警方怀疑宋子豪的恩师龙四利用船厂做掩护，暗中操纵伪钞集团，派宋子杰去接近龙四的女儿，宋子豪为了弟弟的安全，假释出狱，协助警方调查。龙四被亲信陷害逃亡纽约，女儿的被害使他精神失常，在小马哥弟弟阿健的帮助和保护下，才渐渐恢复神智。出于道义，阿健同龙四共同返港。香港这边，宋氏兄弟终于掌握了伪钞集团的犯罪证据，和阿健、龙四会和后，四人策划了火爆的复仇行动。打败熊霸之后，兔二（黄磊 配音）被视为打败邪恶和维护正义的保护者而受到人们膜拜。被突如其来的声望冲昏头脑的兔二不再苦练武功，一心要行走江湖行侠仗义。某一天，兔二在河边救了玄火教的一位长老展天（王劲松 配音），结果就此陷入一场阴谋之中。5. Among the routers that forwarded forged local attack traffic this month, a router belonging to Shanxi Telecom participated in the largest number of attack events. Jiangsu, Shanxi, Shaanxi and Guangdong provinces have the largest number of local counterfeit traffic source routers.呜呜，老子受伤了……魏铜含泪道：你鬼叫什么？跟个娘们似的。汪直已是必死，胡宗宪却依然要活。