Understanding how Facebook disappeared from the Internet

This post provides an external perspective on the Facebook outage, detailing how Facebook's internal BGP and DNS configuration changes led to their services becoming unreachable. It explains the role of BGP in internet routing, shows how Facebook stopped announcing its routes, and the subsequent impact on DNS resolution. The post also highlights Cloudflare's monitoring capabilities, its DNS resolver's resilience during the event, and the cascading effects on other internet services, underscoring the interconnectedness of the internet and the importance of robust network infrastructure.