Category Archives: Active Directory

Windows Server 2012 R2 – Adding Modern DHCP Entries

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I stood up this new Debian box on my network and ran into an issue when I went to reserve the MAC address and found that it was being ignored — well it was actually just using a new type of GUID to keep the same IP no matter what network adapter a machine uses and Server 2012 R2 which is what I’m currently using to handle DHCP on my home lab. You can revert Debian-based distros to continue to use the hardware address (MAC) but in this case I figured I’d just adapt and overcome. Here is an outline of what I did to get this working without upgrading to a newer Windows Server:

  1. Open the DHCP RSAT Tool
  2. Find the lease in my dynamic pool and reserve it
  3. Right click and do properties on it
  4. Copy out the hardware address noting its a lot longer
  5. Fire up PowerShell and use this command on the 2012 R2 DHCP server after deleting the reservations since its not in the block I want:
    1. Add-DhcpServerv4Reservation -ScopeId 10.100.0.0 -IPAddress 10.199.1.30 -ClientId “dda6603200020000ab1149cdd31c16532944” -Description “Debian VM”
    2. In other words: Add-DhcpServerv4Reservation -ScopeId [Scope’s IP] -IPAddress [IP You want to assign this machine] -ClientId “[The Devices DHCP ID]” -Description “Debian VM”

PowerShell – Active Directory – View FSMO Role Holders

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Ever need to view what servers have FSMO roles in your forest or domain? Instead of opening multiple separate GUI tools, use PowerShell!

To view Domain FSMO role holders:
Get-ADDomain | Select-Object InfrastructureMaster, RIDMaster, PDCEmulator

To view Forest FSMO role holders:
Get-ADForest | Select-Object DomainNamingMaster, SchemaMaster