Request for info regarding MAC address population in computer objects

 
Hi,
I am trying to determine how MAC address information is populated in computer objects. I had assumed initially that the hardware scan would be used, but observation shows this information
to be obtained prior to any hardware inventory.
I have laptops that are primarily connected via VPN, and before long their objects lose the internal network interface's MAC address. When I try to rebuild them, they fail to PXE boot. I have
found that importing a CSV of host / MAC / SMBIOD GUID will update the object (rather than having to delete and recreate it) which works temporarily. The MAC will eventually disappear, and the device fail to PXE boot.
I have thousands of these devices to manage, and it is already difficult enough having a CAS and two primaries (the windows Deployment Service on a DP only cares about devices in the DPs primary
site, and so devices that move site are a real pain already, try finding that anywhere in the OSD reference documents!)
I'm assuming now that this information is pulled from the actual client-server connection, and therefore is dynamic(ish), like IP information. If this is the case, more detail around that process,
where to find evidence of  that process occurring would be very useful.

The MAC is updated by hardware inventory and heartbeat discovery. 
Torsten Meringer | http://www.mssccmfaq.de

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