Dyn and affected companies like GitHub are working to undo the damage. Companies can insulate themselves against these attacks by using multiple DNS services.

While it’s still too early to discern the source of the attack or infer a motive, security expert Bruce Schneier reported early last month that someone has been ramping up DDoS attacks, likely probing key portions of the infrastructure of the internet for weaknesses. “We don’t know who is doing this, but it feels like a large nation state,” he wrote. It’s unclear if those probes are related to today’s attack.

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