On 06 Jul 2020, at 17:59, Mark Andrews <ma...@isc.org> wrote:
> Nsupdate can normally determine the name of the zone that has to be updated 
> so most of the time you don’t need to specify the zone.  There are a few 
> cases, like when adding delegating NS records or glue to the parent zone you 
> have to override the normal zone discovery procedure.

So if I were to try adding web2.example.com via nsupdate I could simply 

> update add web2.example.com 96400 IN CNAME www.covisp.net
> send

That's good to know, but I fear I will remember that and use it in cases where 
I do need to specify it and muck things up.

I change DNS settings so infrequently that each time it is almost like starting 
over, especially since the underlying software has changed as well. Also, I 
need better notes, which I am taking this time. (Most of the serials on the DNS 
files are more than two years old)

The latest surprise was that dnssec-enable yes; is obsolete in Bind 9.16. I've 
noticed no fallout from simply uncommenting it, so I assume it is either 
required now or implied with dnssec-validation set or auto-dnssec in the zone 
config.

I do have motivation to get all this nsupdate stuff square, however, as I want 
to move Letsencrypt to wildcard certs and that requires updating the DNS during 
the LE exchange.



-- 
Vi Veri Veniversum Vivus Vici

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