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He said the problem was that he forgot to disable recursive queries on the server, which made his server a tool used by DNS amplification attacks. He explained: "DNS servers can be configured in one of two basic ways. In one possible configuration, the DNS server only provides domain name services (imperative) for the objects it is responsible for serving. In another configuration, in addition to providing those domain name services, the DNS server also searches for any domain (recursively) on the wider Internet that it was not authorized to manage. It is the recursive DNS server that enables the Internet to operate normally. They are also a way of attack. "•老師的「那種事」（西村雅彦）令狐冲一马当先，宝剑指向黑木崖日月神教大殿，爆喝道。　　行动日子逐渐逼近，面对生化武器与人命，情与义，多特面临有生以来最严竣的考验……Through the configuration file my.cnf克劳迪娅和玛丽亚漫步在危地马拉城的街道上。克劳迪娅在一家呼叫中心工作，对周围的世界不感兴趣。她和积极分子祖父住在一起，祖父试图说服她加入他的事业。玛丽亚不像克劳迪娅，她更自然，和母亲住在城市的郊区。混乱的街道上充斥着常见的虐待、无情的警察和迷人的秘密角落。一天晚上，当他们被三个人袭击时，一切都变了。尽管他们设法逃走了，克劳迪娅却面临着选择复仇或听从祖父建议的两难境地。