New installation does not show many existing devices in network

[Ritmo2k]

I re-installed a Dianemo system and the axis camera received an IP but a prompt for the camera to add/ignore it never appeared and its not listed in unknown devices.
I actually don't need this camera added (axis 212 ptz) as it doesn't seem to work with the ios orbiter which already has an app.
My main concern is that as there is no dns server on the core I am concerned the ip might rotate at some point.

How do you guys handle these cases?

Thanks!