While the change from A to CNAME itself is probably not based on security considerations, a CNAME pointing to a CDN or similar can result in future security issues, i.e. you want to closely monitor your externally pointing CNAMEs when you get rid of external services: https://www.hackerone.com/blog/Guide-Subdomain-Takeovers On 06.11.20 05:34, Dovid Bender wrote:
Interesting. We got a few requests at the same time which is what made we wonder. I wanted to make sure that there wasn't something I was missing.
On Fri, Nov 6, 2020 at 5:25 AM Ray Orsini <ray@oit.co <mailto:ray@oit.co>> wrote:
It's not a security thing. We do this with the the resellers who white label our VOIP. CNAMEs allow us to be flexible with our own hosts and infrastructure without having all of our resellers change DNS records. OIT Website <https://www.oit.co/> Ray Orsini Chief Executive Officer OIT, LLC
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------------------------------------------------------------------------ *From:* NANOG <nanog-bounces+ray=oit.co@nanog.org <mailto:oit.co@nanog.org>> on behalf of Dovid Bender <dovid@telecurve.com <mailto:dovid@telecurve.com>> *Sent:* Friday, November 6, 2020 5:07:26 AM *To:* NANOG <nanog@nanog.org <mailto:nanog@nanog.org>> *Subject:* CNAME records in place of A records Hi,
Sorry if this is a bit OT. Recently several different vendors (in completely different fields) where they white label for us asked us to remove A records that we have going to them and replace them with CNAME records. Is there anything *going around* in the security aranea that has caused this?