An unusual DDoS amplification attack was carried out 10 days ago against many of the Internet s 13 root name servers, the authoritative servers used to resolve IP addresses. The attacks happened on Nov. 30 and again on Dec. 1, and each time, massive volumes of traffic, peaking at five million queries per second, were fired at the servers. A note from the Internet Assigned Numbers Authority (IANA) said there was minimal impact to the Internet at large, though some traffic saturated network connections near some DNS root name server instances.
Source: https://threatpost.com/internet-root-name-servers-survive-unusual-ddos-attack/115614/