(BGP-short for Border Gateway Protocol-is the system by which one network figures out the best route to a different network.) Instagram and WhatsApp were reachable but showed HTTP 503 failures (no server is available for the request) instead, an indication that while DNS worked and the services' load balancers were reachable, the application servers that should be feeding the load balancers were not.Ī bit later, Cloudflare VP Dane Knecht reported that all BGP routes for Facebook had been pulled. Facebook-owned Instagram was also down, and its DNS services-which are hosted on Amazon rather than being internal to Facebook's own network-were functional.
The problem goes deeper than Facebook's obvious DNS failures, though. Without working DNS, your computer doesn't know how to get to the servers that host the website you're looking for.
3GHJ3mW0P0- Jim Salter October 4, 2021ĭNS-short for Domain Name System-is the service that translates human-readable hostnames (like ) to raw, numeric IP addresses (like 18.221.249.245). TL DR: Google anycast DNS returns SERVFAIL for Facebook queries querying directly times out.
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