Since some days for a customer of mine Hyper-V requires static MAC addresses to be assigned. Starting a VM with a dynamic MAC address results in a start errir; "No available MAC address for network adapter".
Point is - that worked perfectly until some days ago and there are not enough VM's on that host to actually run out of MAC addresses AND I can change what I want in the MAC address pool, the error does not go away (I have it now for 4096 mac addresses and the machine has not even 30 vm's with a total of maybe 34 NIC's). A new VM I created for test purposes shows all 0's for MAC addresses and then fails to start.
All that we did was install DPM for a test..... can this be related to DPM#s backups?
The software is a current 2012 R2 with all patches installed.