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单身,不擅长与人交流的补习班讲师·大野康臣（成田凌饰）一心只沉浸在最喜欢的数学世界。虽然对现在的生活没有什么不满,但也会担心自己会不会一直一个人。自己也想普通地结婚,但不知道普通到底是什么。即使和女生约会,也会感觉有一种偏离焦点的气氛,却不知道该怎么办才好。学生香住（清原果耶饰）是指出大野不寻常的唯一对象。于是,大野向香住请教：怎么做才能变得普通？到底什么是普通？　　同年，研究生张宁加入，她跟几名伙伴都怀着航天梦，在于杰带领下，成功在嫦娥三号、四号加上了香港团队的名字。她怎么来了？香荽满心疑惑。张富，你是老人了，来给大伙说说Previously, we compared the operation of checking IPTables rules to "check" in "add, delete, change and check". In this article, we will talk about how to "add, delete and change" IPTables.If a service needs to be public-oriented, it needs to provide a user access interface. These interfaces just give hackers the opportunity to take advantage of them. For example, the TCP/IP protocol handshake defect can be used to consume the link resources of the server, The stateless mechanism of UDP protocol can be used to forge a large number of UDP data packets to block communication channels... It can be said that the world of the Internet has not lacked attack points exploited by DDoS since its birth, from TCP/IP protocol mechanism to CC, DNS and NTP reflection attacks, and what's more, it uses various application vulnerabilities to launch more advanced and accurate attacks.