On Friday October 21 a massive Distributed Denial of Service (DDoS) made over 1,000 websites unreachable, including, Twitter, Netflix and PayPal. Two cloud providers, Amazon Web Services and Heroku reportedly also experienced periods of unavailability.

The attack was directed against a key part of the internet’s infrastructure, a domain name system provider, Dynamic Network Services aka Dyn. When a person enters a web address into a browser, such as google.com, the browser in turn needs an IP address (a string of numbers and periods) to actually connect with that web address. Domain name system providers are a critical source of IP addresses.

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