What do you mean by identifier changed Ip address?

That sounds distinctly like something we wouldn't go with 5,000 ft of

So it is useful to be able to run; say a nightly cron-job - or as part of some puppet script - a ‘add_device’ of all your devices; without much ado. I.e. not check if they are already there (and deal with removal differently/explicitly).

At the point of the add_device you want those identifies to be what they are; even if they perhaps resolve to a different IP address at that point of time.

Dw