.blog 02 December 2014 by Anthony Eden — Status This past Monday, we experienced a major volumetric DDoS attack which caused significant downtime for our site and the sites of our customers. The attack included sustained traffic of up to 25gb/s and about 50 million packets per second sent to our servers. I am very sorry that this outage happened and had such sustained and wide reaching effects. We have assembled here what we know about the attack, what we did to mitigate it, and the steps we are taking to mitigate similar attacks. The following post-mortem is a collaboration from the entire DNSimple team. On December 1st, 19:09 UTC, the DNSimple team was alerted by Sensu that the dnsimple.com web site was not resolving. Based on those alerts, our status page was automatically updated to indicate a major outage on our web site and redirector. At 19:19 UTC, we put up a n...