One needs to define two entries to the DHCP User Classes
Open DHCP.mmc → right click relevant DHCP server → select “Set Predefined Options…”
In the resulting window Add:
Option 66:Boot server options
Class: Global
Name: Boot Server Host Name
Data: String
Code: 66
Description: TFTP boot server host name
Then click OK finish
Option 67:Boot file options
Class: Global
Name: Bootfile Name
Data: String
Code: 67
Description: Bootfile Name
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