Since the 2016 DDoS against Dyn, common wisdom has been to use multiple authoritative vendors for your edge.
We wanted to quantify the behavior of resolvers when one authoritative edge failed completely. To our surprise, some resolvers never shifted away from the failing authoritative servers.
This presentation covers this experiment and gives a summary of the results.
Presenter: Shane Kerr, IBM NS1 Connect Back-end ENgineer
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