Web Sites Slowed by DNS Attack on NetSol

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Hundreds of thousands of web sites were slowed for hours today when Network Solutions’ DNS servers were hit by a distributed denial of service (DDoS) attack.

“There is a spike in DNS query volumes that is causing latency for the delay in web sites resolving,” Networks Solutions said on its blog. “This is a result of a DDOS attack. We are taking measures to mitigate the attack and speed up queries.” Posts on network operator mailing lists decribed the issue as a “very large scale” attack.

The attacks began Thursday afternoon, according to posts on NetSol’s customer forums. They recurred on Friday, and are affecting “all” the company’s name servers, according to a report at CircleID.

UPDATE: “DNS queries for web sites should be responding normally,” according to an update from Network Solutions at about 10:30 pm Eastern. “As always, we will continue to work to take measures to prevent these and other types of technical issues caused by third parties that may impact our customers.”

This isn’t the first time a DDoS attack has disrupted a domain registrar’s DNS servers. A 2006 attack on the nameservers for German registrar Joker left about a half million domains unavailable for days. In 2002 the Internet’s root nameservers came under attack, with the DDoS causing network congestion but only minor performance problems for the DNS system.

About the Author

Rich Miller is the founder and editor at large of Data Center Knowledge, and has been reporting on the data center sector since 2000. He has tracked the growing impact of high-density computing on the power and cooling of data centers, and the resulting push for improved energy efficiency in these facilities.

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