[dns-operations] A strange DNS problem (intermittent SERVFAILs)
bortzmeyer at nic.fr
Sat May 30 16:09:24 UTC 2020
Several users on Twitter reported problems accessing Banque Populaire
(a French bank) https://www.banquepopulaire.fr
>From the limited reports, all errors point to a DNS issue. (For one
user, adding the IP address in /etc/hosts solved the problem.)
But testing with existing resolvers and with the RIPE Atlas probes do
not show a widespread outage.
The existing DNS configuration is clearly very questionable, such as a
zone delegated to just one name server, and a broken one, replying
REFUSED for NS and SOA queries.
The question is "how did this incorrect setup can produce *sometimes*
a resolution failure?"
Details in french, plus dig outputs (not in french) are at
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