[dns-operations] Cleaning up glue with dynamic DNS updates

Mark Andrews marka at isc.org
Sat Mar 18 20:14:41 UTC 2017

In message <c73ffb32-7b5e-08df-e6a4-12b5477ed5c7 at ripe.net>, Anand Buddhdev writ
> Hello DNS experts,
> If I am using dynamic DNS updates with a zone, how do I handle cleaning
> up glue records? For example, suppose I update a zone with the following
> (using nsupdate):
> zone example.com.
> update add a.ns.sub.example.com. A
> update add b.ns.sub.example.com. A
> update add sub.example.com. NS a.ns.sub.example.com.
> update add sub.example.com. NS b.ns.sub.example.com.
> send
> At some later time, if I want to change or delete the delegation to
> sub.example.com, how can I ensure that the associated glue records are
> also removed? I don't think nsupdate allows this.

Yes it does.   UPDATE specifies the zone you are working on.  This
allows you to add/remove data below bottom of zone (NS or DNAME).
You just remove the records.

> Oh, I have considered the setup where I have to remember what I added,
> in some persistent storage, so I can look it up later and remove it.
> However, if I don't have such a record in persistent storage, is there
> any way to reliably delete the glue as well?

Just delete the entire RRset then add in what you want it to be.

update del b.ns.sub.example.com. A
update add b.ns.sub.example.com. 3600 A
update add b.ns.sub.example.com. 3600 A

The nameserver will (should) covert that to a minimal delta for IXFR.


> Regards,
> Anand
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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