[atlas] DNS probes: spurious SERVFAIL

Hello,

On Sun, 30 May 2021 at 14:39, Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote:
> > To reproduce, just try to resolve zoom.us or google.us against 8.8.8.8
> > or 1.1.1.1 on your probe.
>
> It works and I don't see one SERVFAIL:
>
> % blaeu-resolve --requested 100 --area North-Central --nameserver 8.8.8.8 --type A google.us
> ...
> Test #30484765 done at 2021-05-30T12:34:54Z

That's a major difference to what I'm seeing, and I don't get why the
difference is so huge.

Just now:1000 probes, area North-Central, A record google.us against 8.8.8.8:

Above 90% of ther answers are SERVFAIL (the rest probably is not in
yet, or timeout).
https://atlas.ripe.net/measurements/30484987/#probes

Only 12 (twelve) probes returned NOERROR.


Lukas