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It's all speculation. Dyn haven't shared anything.
Though it's likely a botnet, and likely Mirai. The worryingg thing is the size. If it is Mirai then it is a larger botnet than anyone thought.
Defence against a DoS attack is simple...
- Have a bigger pipe than the attacker
- Be able to keep up with the incoming traffic
- Be able to throw the bad traffic away
But for Dyn to go down means one of those three things failed. I hope it's the latter two things, computation stuff rather than size of pipe, as Cloudflare and others should stand a chance. But if it's volume of traffic, I'm not sure there is any company that could stands in the way of that botnet.
- Have a bigger pipe than the attacker
Velocio
And, as always, The Register provides a more thorough article on it;
http://www.theregister.co.uk/2016/10/21/dns_devastation_as_dyn_dies_under_denialofservice_attack/