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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."But Peter said every time that they would never come back. I told him very seriously that my parents were heroes and they went to defend the earth. But Peter always laughed at me..."USA宣布续订该台最高收视剧《金装律师 Suits》第七季，这令到该剧将会到达第100集的里程碑。Blue: bluegrass*, Chinese ixora fruit …英达导演的浓彩重墨地描绘都市工作生活的一部情景喜剧，其实提炼的是所有办公室的故事。 几个普通人在一个办公室，同一屋檐下，梦想着自己的梦想，追求着自己的追求。晓明、赵红、大马、珍妮弗，四个经历不同、个性鲜明的人就这样工作、生活在一起；冲突和友爱，利益和互助交织在一起。他们和身边的人演绎着当代都市白领的人间喜剧，还有自己人生的苦辣酸甜。 现代时尚版的“办公室的故事”，通过英达的双重角色(导演和主演)，带领广大观众在笑声中实现坐地日行八万里的欢乐之旅，天天享受“旅行社”老总英达为您定制的娱乐大餐，该剧以《自报家门》、《免费午餐》、《女友的男友》、《不是我不小心》、《办公室》等妙趣横生又意味深远的故事，生动刻画当代白领的喜怒哀乐，深刻反映新新人类的悲欢离合。该剧区别于家长里短式的家庭类电视情景喜剧，力图将收视人群的定位从以往的“妇孺式观众”扩展到上班族、年轻人乃至整个当今中国的中产阶段，真正成为“日报式”的长剧，发挥情景喜剧的长线和时效特点，使之成为广大电视观众每天生活中不可或缺的亲密朋友。国际超级大匪徒拉斯泰波波罗斯企图盗取卡尔库鲁斯教授发明的复制机以达到其偷盗国宝的阴谋，不惜绑架了十三岁的尼科兄妹。为了不让坏蛋得逞，丁丁单刀赴会，经过一番争斗，拉斯泰波波罗斯最终落入法网。