Facebook Down! Facebook Down!
Users around the world probably noticed the massive Facebook outage on Monday, October 4, 2021. If you're a regular user of Facebook, Instagram, Messenger, WhatsApp, or Oculus, then you were probably affected.
There were many rumors circulating around the Internet as to what was causing the problem. Everything from an expired domain to a hacker attack was blamed for the outage, but ultimately, indications were pointing to a DNS error due to improper BGP routing.
What are DNS and BGP?
DNS is short for Domain Name System (or Domain Name Server) and is the method by which domains (like facebook.com) are translated into Internet Protocol (IP) addresses. DNS basically works like a directory, pointing domain names to the IP addresses of servers on the Internet. When DNS fails, traf...