Automate DHCP Server Configuration via PowerShell

By Johan Arwidmark / August 28, 2017

Here is a quick sample on using PowerShell to create static reservation in DHCP for a given virtual machine. This is for a typical Hyper-V Lab scenario, and it was my better half, Ami, who requested it 🙂

You run the script on the Hyper-V host

# Set some variables
$VMName = "OSD-1607-TP-PC0001"
$IPAddress = "192.168.1.17"
$DHCPDescription = "TP Clients"
$DHCPServer = "DC01"
$DHCPScopeID = "192.168.1.0"
$Username = 'VIAMONSTRA\Administrator'
$Password = 'P@ssw0rd'

# Get the Mac Address from a VM and format it (add - in between the pairs of hexadecimal digits)
$Mac = (Get-VMNetworkAdapter -VMName $VMName ).MacAddress
$FormattedMac = $Mac.insert(2,"-").insert(5,"-").insert(8,"-").insert(11,"-").insert(14,"-")

# Print the Mac Address 
Write-Output $FormattedMac 

# Set credentials and allow remote administration via PowerShell to all hosts
winrm set winrm/config/client '@{TrustedHosts="*"}' | Out-Null 
$pass = ConvertTo-SecureString -AsPlainText $Password -Force 
$Cred = New-Object System.Management.Automation.PSCredential -ArgumentList $Username,$pass 
 
# Connect to the DCHP Server and add the reservation 
Invoke-Command -ComputerName $DHCPServer -Credential $Cred -ScriptBlock { param($DHCPScopeID, $DHCPServer, $FormattedMac, $IPAddress, $DHCPDescription, $VMName) Add-DhcpServerv4Reservation -ScopeId $DHCPScopeID -ComputerName "$DHCPServer" -ClientId $FormattedMac -IPAddress $IPAddress -Description $DHCPDescription -Name $VMName } -ArgumentList ($DHCPScopeID, $DHCPServer, $FormattedMac, $IPAddress, $DHCPDescription, $VMName)

Here is the result on the DHCP Server

DHCP01 — The static reservation added to the DHCP Server.

And the result on the client

DHCP02 — *The end result on the virtual machine client.*

Written by Johan Arwidmark