Curious Cloudflare DNS behavior

Fri May 29 17:29:44 UTC 2020

FULL DISCLOSURE: this is an end-user issue, but one that might have some 
operational relevance, particularly if anyone from Cloudflare DNS is on 
the list

EXECUTIVE SUMMARY: twice in six weeks Cloudflare DNS on my new Netgear 
Orbi cable modem/mesh WiFi hotspot has completely lost track of one (and 
only one that I know of) prominent US domain: usbank dot com

Internet provider: Comcast/Xfinity "Extreme Pro+"

Dynamic IP address via Comcast that hasn't changed in six-seven years

New Netgear Orbi cable modem, configured with DNS through Cloudflare 
(1.1.1.1 and 1.0.0.1)

Again, twice in 6 weeks Cloudflare DNS seems to loose complete track of 
usbank dot com as a domain

Symptoms: Firefox on Ubuntu Linux returns that little puzzled dinosaur 
cartoon thing and "We can't seem to find this website right now"

BUT ALSO:

Each one of ping, traceroute, dig and host returns

Host usbank . com not found: 2(SERVFAIL)

or some variant thereof

Everything else works "just fine" as the saying goes

And the Cloudflare DNS drop lasted for days the first time around

I can switch over to Google DNS (8.8.8.8 and 8.4.4.8) in the Orbi and 
immediately fix the problem

So. Seems odd that Cloudflare DNS would apparently loose complete track 
of a major US domain name like usbank dot com

Or am I missing something?

- John
-- 
John Sage
FinchHaven Digital Photography
Email: jsage at finchhaven.com
Web: https://finchhaven.smugmug.com/
Old web: http://www.finchhaven.com/