DNSSEC - KSK Rollover [ Edited ]

[#1]

Hello,

I have a DNSSEC singed zone with the default KSK Rollover period of 1 year. I want to know what happens after 1 year when the rollover period expires naturally.

I understand that a new KSK key pair gets generated and the DNSKEY record set is signed with it and since Double-Sign method is used the old KSK is also valid until the grace period. 

So what is the grace period when the KSK expires naturally? 

If its half the rollover period i.e 182.5 days then do I have this much time to update the registrar with the new DS record? 

Once the new DS record has been updated at the registar I wait for the TTL and then remove the old DS record. Then again wait for the TTL to expire and then remove the old KSK from the zone? Is this the correct way to perform a seamless rollover?

Thank you.

[#2]

Giving this thread a bump, as I have the exact same questions and I am working on deploying DNSSEC on several of our zones.

[#3]

I am currently testing on this in my lab according to manual that supplied by Infoblox. https://insights.infoblox.com/resources-deployment-guides/infoblox-deployment-guide-dnssec

What i noticed if KSK expired (assuming after 365 days), the entire signed zones will become BOGUS. You should be able to noticed the validity of your DNSSEC record through dig www.example.com +dnssec

www.example.com. 300 IN RRSIG A 8 3 300 20231116065751(valid before) 20231114055751(valid after)

Just to share the below link for more reads-up

https://pi-hole.net/blog/2021/12/12/understanding-dnssec-validation-using-pi-holes-query-log/#page-c...

[#4]

Same question here. 

[#5]

If the ‘enable automatic KSK rollover’ is enabled, the KSK key will be rolled automatically but you still need to update the parent zone by exporting the DS key to the registrar.

The rolled key is valid for half the rollover interval. If the rollover period is set to 1y, than the rolled key is valid for 6 months.

So publishing the new KSK key must be done within this period. Keep an eye on the TTL of the zone and don’t wait for the last day to avoid a bogus domain.

Deleting the rolled key at the registrar (after publishing the new one) can be done after publishing the new one but you should wait because cached records.

You can delete the record a week or a month later to be on the safe side.

Deleting the old key in your grid is done by NIOS.