These Three Letter Tech Acronyms Are Likely Behind Today’s Mega Outage At Facebook:
were out of action for almost six hours today
The DNS is like the phonebook of the internet. When someone types facebook.com or the name of any other website into a browser, it converts it into a long, punctuated string of numbers known as an IP address that computers can recognize. The DNS tells the browser the address of the site a user’s looking for and the browser then sends an electronic message to that address requesting the images and content of the site associated with it.
If DNS is the internet’s phonebook, BGP is its postal service. The internet isn’t a homogeneous network, but rather a massive collection of smaller ones known in tech jargon as autonomous systems. These smaller networks are made up of a bunch of routers, often run by a single organization such as internet service providers like Verizon or AT&T. Data needs to be sent across these smaller networks and BGP is a set of rules for determining the most efficient path for routing it.
Malicious activity can also be to blame. In 2008 a Pakistani ISP used BGP to block local users from visiting YouTube by deliberately directing traffic to a dead end. The move triggered a domino effect that ended up causing a widespread outage of YouTube for several hours. There have been other examples of “BGP hijacking”, including one in 2018 in which hackers deliberately diverted traffic meant for Amazon’s DNS to themselves, stealing a reported $100,000 in cryptocurrency as a result.
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