[dns-operations] Cloudflare CNAME ordering issue?

[Joe Abley]

Hey,

On 12 Jan 2026, at 18:20, Joe Abley <jabley at strandkip.nl> wrote:

> On 12 Jan 2026, at 17:00, Dave Lawrence via dns-operations <dns-operations at dns-oarc.net> wrote:
> 
>> Anyone have some examples of what the answers looked like during the
>> incident?  I'm curious about how "the expectations of certain DNS
>> client implementations" were improper.  
>> 
>> From another article I understood that that the Cisco problem was
>> they bombed out when they got the answer, but I'd not be inclined to
>> describe that quite as an issue of their expectations.
> 
> There will be a Cloudflare bog about this that describes things in some detail, some time this week I think.

Sebastiaan's blog is now up, read it while it's hot:

https://blog.cloudflare.com/cname-a-record-order-dns-standards/

We also took the opportunity to dust off a related old internet-draft from 2015 and resubmit it, with this operational impact fresh in our minds:

https://datatracker.ietf.org/doc/draft-jabley-dnsop-ordered-answer-section/


Joe & Sebastiaan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.dns-oarc.net/pipermail/dns-operations/attachments/20260114/03cafbf1/attachment.html>