NS1’s Managed DNS network, along with many other network and infrastructure resources across our platform, came under a series of concerted assaults from a determined attacker. These attacks are an escalation above and beyond a recently observed increase in malicious activity broadly targeting the DNS, CDN, and internet infrastructure industries. The attacks combined high volume traffic floods with more sophisticated strategies including malicious direct DNS queries, random label attacks, and malformed packet attacks. NS1 recommends operators that depend upon DNS as a mission critical component of their infrastructure consider introducing redundancy via multiple authoritative Man managed DNS networks.”]
Source: https://ns1.com/blog/how-we-responded-to-last-weeks-major-multi-faceted-ddos-attacks