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"My suspicions were there was some change of configuration at Facebook, something went wrong and it propagated like a wave coming through the internet." "Right now we're in a world of speculation, but large organisations can make very basic mistakes.
"There are checks and balances to try to catch some of these things, but at a certain level you're playing god-mode with these routing tables."
"A small error propagates out to the entire network," he said. This is the part that's not clear yet, though rumours abound.Īngus speculated that the ultimate cause may have been human error a very senior engineer at Facebook may have made a basic transposition error, and this mistake was propagated through the internet by self-replicating protocols.
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"Somewhere along the way, someone made an update and when it was deployed, those doors have disappeared." "The routing tables are like the front doors to Facebook's various services," he said. "If one or two of those intersections are misconfigured, you end up with internet traffic that gets stuck and doesn't know where to go."įacebook and its sites had effectively disconnected themselves from the internet, said Daniel Angus, a professor of digital communications at QUT.
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"Routing tables are bit like a map of the internet - they explain how to get from this intersection to that intersection," Kowalkiewicz said. The update withdrew the routes to Facebook's IP addresses, meaning servers had no idea where to send requests to access Facebook. dMTevg6hqj- John Graham-Cumming October 4, 2021 Shortly before the outage, Facebook updated its BGP routing tables, according to the internet infrastructure company Cloudflare.Ībout five minutes before Facebook's DNS stopped working we saw a large number of BGP changes (mostly route withdrawals) for Facebook's ASN. Who publishes the tables that show where to find Facebook? Facebook does. Say you type " " into a browser DNS connects that name with the numerical address of one of the Facebook servers.īut what good is an address without any idea of how to get there?īorder Gateway Protocol, or BGP, is that navigation system.īGP uses tables that list the routes to particular network destinations when you send a request to a local server to access Facebook, these tables show the server where to send your request so it eventually reaches Facebook. "It's the system that translates what we type into a browser into an IP address," Kowalkiewicz said. This is what it looked like to /PFw5FR2W5j- John Graham-Cumming October 4, 2021ĭNS stands for Domain Name System, and it functions like an address book for the internet. Moments before the outage began, Facebook stopped announcing the routes to its DNS addresses.īetween 15:50 UTC and 15:52 UTC Facebook and related properties disappeared from the Internet in a flurry of BGP updates.
"We can see what happened, but we don't know exactly what was the cause," said Marek Kowalkiewicz, director of the Centre for the Digital Economy at QUT. So, what happened? And how could a company this big suffer such a glitch? How Facebook fell off the 'map of the internet'
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Messages would not send on Messenger money would not flow on WhatsApp money transfer pages that used Facebook for logins locked users out.Īt Facebook itself, employees reportedly could not use their keycards to enter buildings or access standard office software for work and collaboration.įacebook boss Mark Zuckerberg lost $US9.6 billion as the company's share price plunged.Īs chaos reigned, Facebook executives took to the rival platform Twitter to explain what was happening, and apologise to their own users.īy midmorning, Facebook, WhatsApp and Instagram users began to regain partial access. The effect of that rippled around the globe, as one after the other of its network of services went dark. The tech giant with billions of users and a mission statement of "bring the world closer together" suffered a mysterious technical breakdown early this morning New Zealand time.
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