This paper outlines a Distributed Denial of Service (DDoS) attack which abuses open recursive Domain Name System (DNS) name servers using spoofed UDP packets. A network analysis of one of these attacks is looked at in detail.
You can download it from the following link: https://packetstormsecurity.com/files/download/44824/DNS-Amplification-Attacks.pdf
Source: https://packetstormsecurity.com/files/44824/DNS-Amplification-Attacks.pdf.html