That can't be possible, CF's website explicitly says that their DNS is "always available" with "unparalleled redundancy and 100% uptime"! ;)
In all seriousness, I wonder if they are going to have to change the marketing on the site now...
In all seriousness, I wonder if they are going to have to change the marketing on the site now...
However it is a bit bad of CF that a single configuration error can bring all the slave servers down. It mean that they have no redundancy in term of BGP misstakes. Customers of CF that want to avoid this would benefit to add an additional slave server outside the hand of CF.
Zonemaster (dns sanity checking tool) actually complain about CF hosted domain names because of the lack of AS redundancy. The outage yesterday demonstrate nicely why that is an concern and why one should care. https://zonemaster.iis.se/?resultid=7d1fab165987e195