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We leverage large-scale DNS measurement data on authoritative name servers tostudy the reactions of domain owners affected by the 2016 DDoS attack on Dyn.We use industry sources of information about domain names to study theinfluence of factors such as industry sector and website popularity on thewillingness of domain managers to invest in high availability of onlineservices. Specifically, we correlate business characteristics of domain ownerswith their resilience strategies in the wake of DoS attacks affecting theirdomains. Our analysis revealed correlations between two properties of domains-- industry sector and popularity -- and post-attack strategies. Specifically,owners of more popular domains were more likely to re-act to increase thediversity of their authoritative DNS service for their domains. Similarly,domains in certain industry sectors were more likely to seek out such diversityin their DNS service. For example, domains categorized as General News werenearly 6 times more likely to re-act than domains categorized as InternetServices. Our results can inform managed DNS and other network serviceproviders regarding the potential impact of downtime on their customerportfolio.

No Time for Downtime: Understanding Post-Attack Behaviors by Customers of Managed DNS Providers