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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.在一间加油站，他们遭遇珠宝大盗罗梅（罗伯特•帕特里克 Robert Patrick 饰）及其同伙。罗梅与路过的警察发生冲突，一番枪战过后，罗梅团伙成功逃跑，并劫持凯特为人质。突如其来的变故唤醒约翰的斗志，他开始独身一人追踪劫匪……　　举刀之时，刘彻却改变了主意。他从爱乌及屋的盛怒中冷静下来，在东方慧留下的竹简中受到启迪，顺水推舟，冷眼观察，发现了汲黯这位治世之才。汉武帝故意派汲黯寻找东方慧，将功折罪。汲黯却引来了另一位奇才主父偃，汉武帝以张固再世视之，委以重任。李勇末婚妻秋婵只身潜入大漠，寻找所爱。却不意得知李勇已娶匈奴公主胭脂。秋婵心死，痛不欲生，被霍去病救回长安。汉武帝极看重霍去病，欲为其撮合秋婵，却被秋婵拒绝。汉武帝不听汲黯劝谏，派出使者前往大宛，商购汗血宝正切齿痛恨地想主意，就听外面喊杀震天，原来郑昊将同样的法子用到砢威城来了，那些逃兵有真有假，靖军已经混进城来，真正的攻城战开始了。放入田遥手中，嘱咐道：遥儿……要好好待她。葫芦见他神色异常，忙带他进屋，又喊小葱进去。高智商、高学历的化学工程师吕云鹏，只身前往西南边陲，凭借海关监控和一张快递单，历经数月摸排，锁定了杀害大哥吕云飞父子的凶手，意欲报仇。吕云飞是打入金三角贩毒组织的警察，暴露后被杀，牺牲前通过快递包裹传回情报，因手段非常，警方一直未能破解。女警江伊楠作为吕云飞的搭档和学生，赶赴明山追凶查案，行动中，不断遭遇吕云鹏的冒险行为，百般劝阻。可吕云鹏软硬不吃，且凭借超凡的化学专业知识与过人的智慧胆识，与警方同步接近着真相，甚至破译出大哥遗留密码的真实含义。