Facebook was down for five hours last week. What happened and what do DNS and BGP have to do with it?

Facebook's explanation: https://engineering.fb.com/2021/10/05/networking-traffic/outage-details/

Support these videos on Patreon: https://www.patreon.com/beneater or https://eater.net/support for other ways to support.

0:00 DNS
7:13 Caching DNS
10:34 Hop-by-hop routing
14:07 Default-free routing
18:28 Peering
19:50 BGP
26:08 The outage

------------------

Social media:
Website: https://www.eater.net
Twitter: https://twitter.com/ben_eater
Patreon: https://patreon.com/beneater
Reddit: https://www.reddit.com/r/beneater

Special thanks to these supporters for making this video possible:
Aleksey Smolenchuk, Anders Carlsson, Andrew C. Young, Anson VanDoren, Anthanasius, anula, Armin Brauns, Ben, Ben Cochran, Ben Kamens, Ben Williams, Benny Olsson, Bill Cooksey, Binh Tran, Bouke Groenescheij, Bradley Pirtle, Bradley Stach, Bryan Brickman, Burt Humburg, Christopher Blackmon, Dale Andrew Darling, Daniel Jeppsson…