OpenDNS System

OpenDNS website was down briefly; DNS service not interrupted

Palo Alto – Online

posted on December 1, 2006 11:40 pm UTC

About 21:00 UTC on December 1, EveryDNS, the authoritative DNS service used by OpenDNS, was flooded with a Denial of Service (DOS) attack. One result: the website was no longer showing up in DNS, making it effectively unavailable. This website outage lasted for approximately 90 minutes before authoritative DNS for (and, etc.) was moved to different servers, bringing the website back online.

OpenDNS’s core recursive DNS service was not affected during this period.

OpenDNS customers might have noticed two things during this period. First, anyone who hit a known phishing site during this period would have had the page hang, instead of getting the usual “phish blocked” page. Similarly, anyone who requested a domain which does not exist during this period would have had the page hang instead of getting the usual search results page.

David Ulevitch, the CEO of OpenDNS, also owns and operates EveryDNS. However, EveryDNS is a separate company.

EveryDNS is taking steps to mitigate and filter the attack to bring its customers back online. As I write this, the DOS attack on EveryDNS is ongoing. As we learn more, we will share on the main OpenDNS blog.

John Roberts
VP of Product

—John Roberts

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