A review of the Cloudflare outage points to a novel (and powerful) use of

A review of the Cloudflare outage points to a novel (and powerful) use of the Network Time Protocol (NTP) in a DDOS amplification attack. http://arstechnica.com/security/2014/02/biggest-ddos-ever-aimed-at-cloudflares-content-delivery-network/
http://arstechnica.com/security/2014/02/biggest-ddos-ever-aimed-at-cloudflares-content-delivery-network