Wednesday, October 20

Cloudfare explains why Facebook disappeared from the Internet | Digital Trends Spanish


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The people of Cloudfare has possibly the most sensible answer as to why Facebook and its derivatives Instagram and WhatsApp They are down from 16:51 UTC this Monday, October 4.

One of the things that explains it simply is that it was as if someone had “pulled the cables” from their data centers at once and disconnected them from the Internet, since the DNS had no response and the infrastructure IPs were inaccessible. .

The key to BGP

For Cloudfare (an American web infrastructure and website security company that provides DDoS mitigation services and content delivery networks), the key is in BGP. What is this?.

The explanation is the following:

“BGP is Border Gateway Protocol. It is a mechanism for exchanging routing information between autonomous systems (AS) on the Internet. The great routers that make the Internet work have huge constantly updated lists of possible routes that can be used to deliver each network packet to its final destinations. Without BGP, Internet routers wouldn’t know what to do, and the Internet wouldn’t work. The Internet is literally a network of networks, and it is linked by BGP. BGP allows a network (say Facebook) to advertise its presence to other networks that make up the Internet. As we write, Facebook is not advertising its presence, ISPs and other networks cannot find Facebook’s network and therefore it is not available. Each of the individual networks has an ASN – an autonomous system number. An autonomous system (AS) is an individual network with a unified internal routing policy. An AS can originate prefixes (let’s say they control a group of IP addresses), as well as transit prefixes (let’s say they know how to reach specific groups of IP addresses) ”, the people of Cloudfare detail with great precision.

Cloudfare acknowledges that at 16:58 UTC Facebook stopped advertising the routes to their DNS prefixes, therefore they had disconnected from the Internet.

This not only caused external communications with users to fail, but also the same employees recognized internal communication connection errors and even the inability to access the institutional buildings of the Zuckerberg company.

Cloudfare’s conclusion: “Because Facebook stopped advertising its DNS prefix routes over BGP, our DNS resolvers and everyone else’s had no way to connect to their nameservers. Consequently, 1.1.1.1, 8.8.8.8, and other major public DNS resolvers began issuing (and caching) SERVFAIL responses. ”

Many people also trying to access the systems, reloading the pages and applications of Facebook, Instagram and WhatsApp, have slowed down the recovery even more.

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