content: I don't think there's a botnet that could use that much bandwidth.  Maybe there's one that could take on one of those cities, but not all of them together.  My money is on an engineer not fully checking out an update before applying it. That person will also likely be looking for a new job today. It's hit or miss. My main office in one of the affected cities is fine. Another office that I moonlight at in another part of the city about 10 miles away is down.  EDIT: redundancy removed redundancy