Samba AD DC Upgrade and IP address management

Greetings all,

I've been a faithful reader of this list for about the last 5 years, but I
can't remember or find a post that answers my current question.

I'm needing to upgrade my Samba AD DCs so I can join Windows 11 PCs to the
domain. Since my DCs are older versions 4.10.x, so I have started by
spinning up a Debian 13.4 instance with Samba 4.22.8 AD DC and joining that
to my existing domain. samba-tool drs showrepl indicates all is well.

Now I need to upgrade or replace the two original AD DCs. I understand that
once I get all the servers replaced I will need to upgrade the schema to
2016 to keep Windows 11 happy. Also, once I get that done, I intend to
setup debian backports so I can get the most recent versions of samba.

Since my network is small - I have everything on a /24 subnet - and  all my
PCs use the samba servers as their DNS servers, I'd like to continue using
the same IP addresses for the replacement AD DCs that I've been using. Is
that possible? I seem to recall some warnings about that.

Can I demote a DC, delete the VM/container and replace it with a new one
with the same name and IP address and rejoin it to the domain? If so, what
precautions do I need to take.

Thanks,
Jonathan Kreider
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