The Internet is a cooperative system: CNAME to Dyn DNS outage of 6 July 2015

What this post added

This post details a specific incident where an outage at Dyn, a major DNS operator, caused DNS resolution errors for Cloudflare customers using CNAME records. It explains the technical mechanism of CNAME resolution and how upstream DNS provider issues can cascade. The post also highlights Cloudflare's immediate response, debugging process, and collaboration with Dyn to resolve the issue, emphasizing the cooperative nature of the internet.