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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.她是真不知道？还是演技太高超？尹旭有些疑惑，难以断定。赵文华就像个无底洞，刚刚满足了他设立军器坊的要求，如今又有新的由头。Learning thinking and learning methods are very important, resulting in three situations of confusion and poor harvest: short contact thought comprehensive, incomplete mastery eager to overthrow, insufficient comprehension and rhetoric, and the most important thing in learning is to keep a large period of time and practice deliberately patiently and modestly.七十年代的京剧信息团，宋雨和邢涛是一对情窦初开的恋人，一场突如其来的大火烧死了邢涛的父亲邢文江和叶1日凯的妻子于晓霞。两个家庭因为这场大火反目成仇，也改变了这对恋人之间单纯的关系。因大火，宋雨的父亲宋德海入狱，宋雨被开除。不甘心的宋雨并没有放弃回到剧团的渴望，终于在一次借调演出后又被调回剧团。当年的大火一直在她心头燃烧，这场火充满了疑问和悬机，她想解开这个谜。剧团的演员怀着各自的目的加入到查案追凶当中，最后发现，凶手只是死者本人。在欲爱不能的岁月，他们选择了死亡。当一切真相大白，宋雨和邢涛牵手，把剧团带出了困境。那天王爷回来的时候，人山人海，到了家，事儿肯定更多，那时候上门也添乱。In the second episode, Sheng Qing, a teacher from Fudan University's School of International Cultural Exchange, and Gu Chen, a lecturer in Chinese as a foreign language from Shanghai University's School of International Exchange, were invited to recall their college entrance examination experiences in 1987 and 1997 in the 10 and 20 years after 1977. This paper reviews and discusses the development process of major measures in recent years, such as the expansion of college enrollment, the reform of higher education, student loans, college-based general education, and the independent employment and entrepreneurship of college students.