experiences with changing a name space or operating two different name spaces?

hi all,
does anyone have experiences with changing a name space or operating two different name spaces?
for example: migrate from '.local.lan' (a private name space) ->
'.domainX.com' (an official name space)
in particular the impact on software and client/server infrastructure.

the only way of achieve such a mayjor change is by operating a parallel
dns-infrastructure and to migrate applications and systems via lifecycle
processes.
so does anyone have experience with operating two different name spaces?

i think the new dns-installation is the easiest part of the entire change.

Best regards
HP



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