[HN Gopher] What is BGP? - BGP routing explained
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What is BGP? - BGP routing explained
Author : franl
Score : 145 points
Date : 2021-10-04 20:16 UTC (2 hours ago)
(HTM) web link (www.cloudflare.com)
(TXT) w3m dump (www.cloudflare.com)
| kristjank wrote:
| I have a hunch that the "How BGP can break the Internet" will get
| updated in the near future :^)
| sarosh wrote:
| There is _already_ a nice writeup on the current incident from
| Cloudflare at https://blog.cloudflare.com/october-2021-facebook-
| outage/
|
| They key observations:
|
| "Due to Facebook stopping announcing their DNS prefix routes
| through BGP, our and everyone else's DNS resolvers had no way to
| connect to their nameservers. Consequently, 1.1.1.1, 8.8.8.8, and
| other major public DNS resolvers started issuing (and caching)
| SERVFAIL responses.
|
| But that's not all. Now human behavior and application logic
| kicks in and causes another exponential effect. A tsunami of
| additional DNS traffic follows.
|
| This happened in part because apps won't accept an error for an
| answer and start retrying, sometimes aggressively, and in part
| because end-users also won't take an error for an answer and
| start reloading the pages, or killing and relaunching their apps,
| sometimes also aggressively."
| NetBeck wrote:
| Cloudflare has a useful tool for measuring if your ISP is using
| RPKI.[0] For Facebook, this is the latest I could find for their
| implementation of BGP.[1][2]
|
| [0] https://isbgpsafeyet.com/
|
| [1] https://engineering.fb.com/2021/05/13/data-center-
| engineerin...
|
| [2]
| https://www.usenix.org/conference/nsdi21/presentation/abhash...
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(page generated 2021-10-04 23:00 UTC)