![]() As a direct consequence of this, DNS resolvers all over the world stopped resolving their domain names. Meanwhile, other Facebook IP addresses remained routed but weren’t particularly useful since without DNS Facebook and related services were effectively unavailable.īut at around 15:40 UTC we saw a peak of routing changes from Facebook. Because of this Cloudflare’s 1.1.1.1 DNS resolver could no longer respond to queries asking for the IP address of or. ![]() That meant that, at least, Facebook’s DNS servers were unavailable. At 1658 UTC we noticed that Facebook had stopped announcing the routes to their DNS prefixes. An AS can originate prefixes (say that they control a group of IP addresses), as well as transit prefixes (say they know how to reach specific groups of IP addresses). An Autonomous System (AS) is an individual network with a unified internal routing policy. The individual networks each have an ASN: an Autonomous System Number. As we write Facebook is not advertising its presence, ISPs and other networks can’t find Facebook’s network and so it is unavailable. ![]() BGP allows one network (say Facebook) to advertise its presence to other networks that form the Internet. Info: The Internet is literally a network of networks, and it’s bound together by BGP.
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