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上海名牌大学毕业的苏拉（林心如 饰）与颜如玉（曾黎 饰）是一对共患难的好朋友。刚毕业的她们工作还没有着落便要面临经济困扰，苏拉还在爱情上受挫，两人身心疲惫。她们俩发誓要立足上海，接着在好友芳芳的帮助下终于有了落脚的地方，更幸运地进了同一所旅行社工作。Don't pay attention to the title, pure clickbait title, but there are dry goods! Yesterday, I saw a "Daniel" writing an article. On the homepage recommendation, It is called "Learning Artificial Intelligence with String Elder Brother", It was quite a surprise to see the title. After all, there were still bosses willing to write AI articles in the blog park, a technical forum dominated by. Net articles. So I clicked to look at it carefully and found that the style of writing was grandiose. Well, it doesn't matter, just have dry goods. As a result, I didn't find any dry goods in the end. I saw the bibliography, which was very interesting. Put a picture here:Compared with the new drama IRIS, which is also being broadcast, the "Suspicious Three Brothers" has no "Korean big name" at all. The screenwriter of the drama is Wen Yingnan, the screenwriter of the "Wife Club of the Drop", which once achieved 40% high ratings in South Korea. Wen Yingnan is famous for writing family dramas. Apart from "The Wife Club of the Broken Furfural", it was also written by Wen Yingnan.因此，凡王尚书、张杨问话，他都规规矩矩地回答。Know the principle man: Very good, your experience value has improved a lot. However, we can't start fighting monsters yet. After all, no monster can be directly sprayed to death. You lack tools. Then at this stage, we need to strengthen our programming ability. First find a framework to come down, read the source code, what? You said you can't read the source code, it doesn't matter, there are a lot of experience reading the source code online. Of course, the basis of these experiences is without exception: read more and write more. On this basis, find trick again. After the source code of the framework is set down, change some codes to run, debug them, and then constantly find out the reason to see how each API is written, and try to write it yourself. Write more and practice more. After 30 years of hard coding, you will definitely get something.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.2. Exception maintenance