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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.青鸾公主总不会只值十头二十头羊吧？据我所知，公主可是孔雀王的继承人，并非普通的公主。一天晚上，马特试图制止一场打斗，却因此变成了杀人犯。如今，有犯罪前科的他重建了自己的生活，但是一个来电打破了这一切。不少啊。也没说太多东西，一来张家根基浅薄，确无甚可说。一幢并不奢华的公寓，两间普普通通的套房，住着七个不同背景，不同身份，不同理想的青年男女。 　　就在这里，每天都发生着看似平常却又乐趣十足的幽默故事。时而搞笑、时而离奇、时而浪漫、时而感人。 　　胡一菲、陆展博、曾小贤、林宛瑜、吕子乔、陈美嘉、关谷神奇，无一例外，他们都是有故事的人。他们在一起，用嬉笑怒骂传达新一代年轻人的生活状态和价值观念；他们在一起，用连珠妙语擦出令人捧腹不已的精彩笑料和智慧火花。 　　《爱情公寓》为你带来七个亲密的邻家伙伴，展开连场爆笑无敌的青春画卷。