The largest DNS reflection attack ever recorded, which peaked at 167 Gigabits per second (Gbps) The company did not name the target of the digital assault. Using Internet protocol spoofing, the source address is set to that of the targeted victim, which means all the replies will go to the target. The attack was the attack method used in Operation Stophaus, an attack waged in March by The Spamhaus Project, a Geneva-based not-for-profit organization dedicated to fighting Internet spam.
Source: https://thehackernews.com/2013/05/massive-167gbps-ddos-attacks-against.html