Facebook post-mortems...

Tue Oct 5 15:50:18 UTC 2021

Niels, you are correct about my initial tweet, which I updated in later
tweets to clarify with a hat tip to Will Hargrave as thanks for seeking
more detail.

Cheers,
Ryan

On Tue, Oct 5, 2021 at 08:24 Niels Bakker <niels=nanog at bakker.net> wrote:

> * telescope40 at gmail.com (Lou D) [Tue 05 Oct 2021, 15:12 CEST]:
> >Facebook stopped announcing the vast majority of their IP space to
> >the DFZ during this.
>
> People keep repeating this but I don't think it's true.
>
> It's probably based on this tweet:
> https://twitter.com/ryan505/status/1445118376339140618
>
> but that's an aggregate adding up prefix counts from many sessions.
> The total number of hosts covered by those announcements didn't vary
> by nearly as much, since to a significant extent it were more specifics
> (/24) of larger prefixes (e.g. /17) that disappeared, while those /17s
> stayed.
>
> (There were no covering prefixes for WhatsApp's NS addresses so those
> were completely unreachable from the DFZ.)
>
>
>         -- Niels.
>
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