[dns-operations] Also any Microsoft CDN people here?

[Joe Abley]

On 27 Nov 2025, at 17:18, Gavin McCullagh <gmccullagh at gmail.com> wrote:

> If you want to call this "stupid DNS tricks", feel free.


(that's my favourite name for them, for sure)

> But I don't understand why it is illegal or "invalid" to create, modify or delete cnames in response to events.

I am not necessarily disagreeing with you philosophically and I understand that what you are talking about is the nuance of the word "invalid".

In this particular case, though, what is happening is that we are giving a NODATA response when we should be returning a CNAME. It definitely looks like a bug to us and we have a ticket open to fix it. I think it's fair to say the way we are responding in this case is not a good representation of what is happening in the zone. It's not the biggest bug I have ever seen but it's not intended behaviour. 

I am also interested in whether this behaviour is causing a discernible problem for anybody, since if we have an example of a problem it will help us prioritise a fix. It looks to me like we should fix this but nobody's day is being ruined if we take our time. 


Joe