Hi Libor,

> On 26 Oct 2023, at 12:26, libor.peltan <[email protected]> 
> wrote:
> 
> Hi,
> I'm not sure if this helps the discussion, but Knot DNS implements "DS push", 
> an automated DDNS update
> updating the DS (not NS) at parent.
> It's mostly intended for single-organization parent-child relations, where 
> TSIG (or soon DDNSoQ) can
> be configured easily.

I was not aware of this, but “DS push” is clearly an implementation of a the 
special case (just the DS) of what I would like to see in the child primary. 
Many thanks for sharing. The limitation of intended use to single organization 
is easily understandable and those limitations are exactly what I would like to 
remove with my draft:

* by defining a mechanism for how to locate the target for the dynamic update 
via a DNS lookup

* by using SIG(0) rather than TSIG to make it more scalable across multiple 
organisations

I also note that in the Knot-DNS documentation it says about “ds-push” that 
"this feature requires cds-cdnskey-publish not to be set to none.” 

I agree completely, this is exactly the choices we have if we want to achieve 
full automation of updates to delegation information: publish a CDS if we have 
a parent that runs a CDS scanner OR update the DS directly via a DNS UPDATE for 
all the cases where there is no parent scanner.

Regards,
Johan

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