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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.In the example above, the-R option means modifying the specified chain, Using-R INPUT 1 means modifying rule 1 of the INPUT chain, Using-j REJECT means that the action of changing the first rule in the INPUT chain to REJECT. Note: In the above example, the-s option and the corresponding source address cannot be omitted. Even if we have already specified the number corresponding to the rule, when modifying a rule with the-R option, we must specify the original matching condition corresponding to the rule (if there are multiple matching conditions, we need to specify them).第二季末，华生预备搬离褐石居。本季，华生将会有一位新男友，而福尔摩斯也会有一位新助手。故事将开始于上一季的一年之后，福尔摩斯在英国为MI6服务了一年之后，携新助手回到纽约。他将如何处理他与华生之间的关系？华生的恋爱生活又会如何发展？新人新气象，老友又聚首，2014年10月30日，且看褐石居侦探二人组能否结束分居生活，顺利“复婚”。传世名著又新生，且看编剧如何解局。如今热闹的什刹海，打破了名厨庄大爷一家原本平静的生活。随着中国通大卫的到来，不拘小节处处冒犯着庄老爷子的老理儿和规矩。大卫的目的是为了接近庄家女儿---庄静，大卫心中的东方女神。大卫为拍庄大爷马屁，跟他学习太极拳，与庄大爷感情迅速增进，顺理成章做了庄大爷的徒弟。大儿子志存有着稳定的工作，一直在追求着自己爱情的重生。然而后悔的前妻重回他的生活中，在女儿的帮助下，执着、刁蛮、无理取闹的前妻让他爱情重生的机会化作泡影。老三志斌为人仗义、好爽。典型宁折腰不折面儿的性格，人到中年越混越不济，各种投资理财被坑，好心办坏事，又因琐事激起家庭矛盾，终被赶出庄家。饱受世态炎凉，下定决心痛改前非，最终得到家人的原谅。除夕之夜，昙花盛开，每个生活在什刹海的勤劳朴实的北京人，快乐的过了一个幸福吉祥的春节。龙且愤然离去确实不争的事实，亲兵迅速将这个消息禀报上去。因三年前的一场车祸而双目失明的年轻英俊的百万富翁Chisanu Naresuan在华欣巧遇了正打算自杀的幼儿园教师 Nathlada， 阴差阳错之下Nu救了Lada。 Lada误认为他是一个贫穷而又瞎的渔夫， 从而打消了自杀的念头， 并且非常感谢Nu挽救了她的生命。住在法国的朋友Pruk来电告诉Nu，医生已经找到了适合他的角膜， 因此他必须尽快去法国做手术。 Lada的善良和真诚深深打动了Nu，他不想和Lada就此分别, 于是他设计让Nathlada嫁给了他， 带着Lada一起去了法国。 Nu的前女友Lizzy和律师的女儿Mit拼命想拆散Nu和Lada, 欺骗Lada的前男友P′tem不甘心跟Lada分手，一群人尾随着Nu去了法国，并设计了很多阴谋诡计使Nu和Lada之间产生了一连串的误解。最终Nu和Lada是否能消除种种误会，幸福地生活在一起呢？……印度09最新喜剧,是著名的阿拉伯民间故事合集，它凭借丰富的想象、生动的描写风靡全世界，神话故事《阿拉丁》也出自这个合集，它曾多次被搬上大银幕。