DDoS attacks on DNS Root Servers

Unknowns allegedly carried out large-scale DDoS attacks on DNS root Internet servers, causing slight interruptions in four nodes. The affected servers were at nodes B, C, G and H, according to the root-servers.org.

DDOS Attack Concept. The Word of Red Color is located over Text of White Color.

Two different attacks took place. The first started on 30 November, and lasted 160 minutes (from 6: 50 to 9: 30 UTC), and the second, which was smaller scale than the first, became 1 in December and lasted only one hour (from 5: 10 to 6: 10 UTC).

Administrators of DNS root servers report that the attacks were valid DNS queries addressed to two different domains (another in the first attack and the other in the second).

Each attack sent about five million queries a second per root name server DNS. Server administrators do not expect to catch the culprit, or the culprits, as the IP addresses of the source can be easily falsified, and the IP addresses used in the DDoS attacks were well spread and randomized across IPv4.

DDoS attacks did not cause any serious damage beyond a mere delay to some users.

"The DNS root name server system worked exactly as designed, proving its overall resilience to large-scale traffic floods seen on many DNS root servers," said the server administrators.

Due to the way the DNS servers work, with a grid structure that looks like the Internet itself, if a server does not respond, other servers are interfering to prevent the millions of questions they receive.

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Written by giorgos

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