[191222] in North American Network Operators' Group
Cloudflare reverse DNS SERVFAIL, normal?
daemon@ATHENA.MIT.EDU (Jeremy)
Mon Aug 29 16:46:09 2016
X-Original-To: nanog@nanog.org
From: Jeremy <jbaino@gmail.com>
Date: Mon, 29 Aug 2016 13:46:05 -0700
To: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
We're seeing a huge uptick in reverse dns lookup failures across an app,
99% are all for Cloudflare ip addresses.
Instead of seeing a PTR or NXDOMAIN we're getting back SERVFAIL.
Does anyone know if this is a standard response from them? Do they not have
reverse DNS setup for their networks?
Trying to narrow this down to see if it's a result in a change in how our
application handles these errors or if there's an issue going on with
cloudflare's DNS setup.
Thanks!
Jeremy
