What is a security threat? A network security threat is any unwanted traffic trying to get onto your network or cause harm to it. Today I want to talk about a DNS reflection attack which is when attackers send a large number of queries from a spoofed source address to your DNS. The address which is spoofed is typically that of the victim. When the requests are received by the name server, all ensuing responses to these queries are directed back towards the spoofed IP of the victim. Recently, one of our customers detected a DNS reflection attack with our network threat detection solution and shared the following story.