In the night of 26-27 Januari we were notified of a heavy DDOS attack on some of our DNS endpoints. We migrated these endpoints to our failover provider and were back up with these endpoints after 2 hours. Because we first need to come into contact with our DNS provider during that late hour the fix identification took longer than we wish for. However, because the downtime was late at night and only for our web portal, impact was minimal.
Today 27th of January, we saw a similar attack taking place at our other endpoints, and we instantly migrated over to our failover DNS. This took about 30 minutes and some propagation time before we were back online again.
Our current DNS is more robust against DDOS attacks. We are improving our DNS failover process in the future to minimize downtime and impact of a switch if deemed necessary.