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[atlas] DNS probes: spurious SERVFAIL

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Sanjeev Gupta ghane0 at gmail.com
Sun May 30 15:33:32 CEST 2021

Lukas, I just tried as well, and I see no issues:

sanjeev at T450s-disco:~$ blaeu-resolve --requested 100 --area North-Central
--nameserver 8.8.8.8 --type A google.us
Nameserver 8.8.8.8
[172.217.17.100] : 1 occurrences
[142.250.75.228] : 1 occurrences
[216.58.209.68] : 1 occurrences
[142.250.184.4] : 3 occurrences
[142.250.179.100] : 1 occurrences
[142.250.186.68] : 1 occurrences
[142.250.179.196] : 5 occurrences
[172.217.16.132] : 2 occurrences
[142.250.184.36] : 3 occurrences
[142.250.185.164] : 4 occurrences
[172.217.16.68] : 2 occurrences
[172.217.218.103 172.217.218.104 172.217.218.105 172.217.218.106
172.217.218.147 172.217.218.99] : 1 occurrences
[142.250.186.36] : 2 occurrences
[216.58.209.36] : 1 occurrences
[216.58.215.164] : 1 occurrences
[172.217.16.36] : 1 occurrences
[142.250.187.164] : 2 occurrences
[172.217.168.196] : 1 occurrences
[74.125.193.103 74.125.193.104 74.125.193.105 74.125.193.106 74.125.193.147
74.125.193.99] : 1 occurrences
[142.250.180.4] : 1 occurrences
[172.217.18.68] : 1 occurrences
[172.217.18.196] : 1 occurrences
[172.217.23.228] : 2 occurrences
[173.194.222.103 173.194.222.104 173.194.222.105 173.194.222.106
173.194.222.147 173.194.222.99] : 1 occurrences
[142.250.150.103 142.250.150.104 142.250.150.105 142.250.150.106
142.250.150.147 142.250.150.99] : 1 occurrences
[216.58.207.196] : 1 occurrences
[142.250.185.132] : 1 occurrences
[172.217.168.36] : 3 occurrences
[216.58.198.36] : 1 occurrences
[216.58.208.132] : 1 occurrences
[172.217.23.196] : 2 occurrences
[142.250.179.132] : 2 occurrences
[172.217.20.4] : 1 occurrences
[142.250.187.196] : 1 occurrences
[172.217.168.228] : 1 occurrences
[216.58.215.228] : 1 occurrences
[142.250.74.4] : 1 occurrences
[216.58.212.100] : 1 occurrences
[142.250.74.196] : 1 occurrences
[TIMEOUT] : 2 occurrences
[142.250.185.196] : 1 occurrences
[142.250.200.36] : 2 occurrences
[216.58.207.164] : 2 occurrences
[216.58.204.100] : 1 occurrences
[142.250.181.196] : 1 occurrences
[216.58.198.4] : 1 occurrences
[142.250.200.132] : 1 occurrences
[142.250.180.164] : 2 occurrences
[216.58.209.4] : 1 occurrences
[142.250.180.228] : 1 occurrences
[216.58.214.68] : 1 occurrences
[142.250.74.132] : 1 occurrences
[216.58.213.132] : 1 occurrences
[172.217.18.100] : 1 occurrences
[172.217.16.228] : 2 occurrences
[142.250.184.132] : 2 occurrences
[172.217.23.36] : 1 occurrences
[74.125.131.103 74.125.131.104 74.125.131.105 74.125.131.106 74.125.131.147
74.125.131.99] : 1 occurrences
[142.250.74.100] : 1 occurrences
[142.250.184.164] : 1 occurrences
[216.58.211.4] : 1 occurrences
[216.58.215.132] : 1 occurrences
[216.58.208.100] : 1 occurrences
[142.250.185.68] : 1 occurrences
[172.217.22.132] : 1 occurrences
[216.58.214.196] : 1 occurrences
[216.58.207.228] : 1 occurrences
[172.217.169.164] : 1 occurrences
[142.250.185.228] : 1 occurrences
[108.177.14.103 108.177.14.104 108.177.14.105 108.177.14.106 108.177.14.147
108.177.14.99] : 1 occurrences
[172.217.168.4] : 1 occurrences
[216.58.209.164] : 1 occurrences
Test #30485569 done at 2021-05-30T13:06:25Z

sanjeev at T450s-disco:~$ echo $?
0

https://atlas.ripe.net/measurements/30485569/#probes
-- 
Sanjeev Gupta
+65 98551208     http://www.linkedin.com/in/ghane


On Sun, May 30, 2021 at 8:50 PM Lukas Tribus <lukas at ltri.eu> wrote:

> 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
>
>
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