Does any one know the technical details of the attack? The article simply refers to it as 'highly advanced denial-of-service attacks'.

From the fact that it knocked off their upstream providers also means it was probably just a simple volumetric attack like an NTP or DNS reflection attack. These are relatively easy to defend against.

I work for an ISP that gets hit with 5 or 6 of these a week, but because of the mitigation strategies we have in place our customers don't even notice...