The popular social media platforms Facebook, Instagram, WhatsApp, and Messenger, are back online following a massive disruption that lasted almost six hours. Billions of people worldwide have been unable to access the platforms because of a BGP routing issue.
As showed by BleepingComputer, when trying to connect directly to the Facebook DNS servers shown below, they were also inaccessible.
Disruption Caused by a BGP Routing Problem
Giorgio Bonfiglio, a Principal TAM at Amazon aws, explained that several Facebook routing prefixes had mysteriously vanished from the internet’s BGP routing tables, effectively rendering any services hosted on their IP addresses inaccessible.
A bunch of Facebook networks has just disappeared from the internet: pic.twitter.com/j07LrmAAdW
— Giorgio Bonfiglio (@g_bonfiglio) October 4, 2021
According to Wikipedia,
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. BGP is classified as a path-vector routing protocol, and it makes routing