Original function/new-labvm function.ps1

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function New-LabVM
{
  <#
      .SYNOPSIS
      Creates a new VM in the lab environment
      .DESCRIPTION
      Creates a new VM in the lab environment. Takes the name and IP-address of the VM as a parameter.
      IP-address must be in the 192.168.0.1/24 notation. The specification of a DNS-server and gateway is optional.
      If DNS-server or gateway is not specified, the default will be used.
      .PARAMETER VMName
      Specifies the name for the newly created VM, both as VM Name in Hyper-V and as hostname.
      .PARAMETER VMIP
      Specifies the IP-address for the newly created VM.
      .PARAMETER DNSIP
      Specifies the IP to use as DNS server in the newly created VM. If not specified, the default will be used.
      .PARAMETER GWIP
      Specifies the IP to use as gateway for the newly created VM. If not specified, the default will be used.
      .EXAMPLE
      New-LabVM -VMName HOSTNAME -VMIP 10.0.0.18/29
      .EXAMPLE
      New-LabVM -VMName Hostname -VMIP 192.168.123.20/24 -DNSIP 8.8.8.8 -GWIP 192.168.123.1
  #>

  param
  (
    [Parameter(Mandatory=$true, Position=0)]
    [string]
    $VMName,
    
    [Parameter(Mandatory=$true, Position=1)]
    [string]
    $VMIP,
    
    [Parameter(Position=2)]
    [string]
    $DNSIP = '8.8.8.8',

    [Parameter(Position=3)]
    [string]
    $GWIP = '172.16.10.1'
  )
  
  #region define variables
    
    # Script Variables that are the same for each server
    # Adjust these variables according to your environment
    $diskpath = "C:\vhdx\$VMName.vhdx"
    $ParentDisk = 'C:\vhdx\W2K16_Template.vhdx'
    $VMSwitch = 'NATswitch'
    $SourceXML = 'C:\Users\SvenvanRijen\Documents\GitHub\Experts-Live-2016\unattend.xml'
  #endregion
  
  #region create diff disk
    # Create new differencing disk
    New-VHD -ParentPath $ParentDisk -Path $diskpath -Differencing
  #endregion
  
  #region copy adjusted answer file
    # mount VHD
    $VHD = (Mount-VHD -Path $diskpath -Passthru |
      Get-Disk |
      Get-Partition |
      Where-Object -FilterScript {
        $_.Type -eq 'Basic' 
    }).DriveLetter
    # add XML Content
    [xml]$Unattend = Get-Content $SourceXML
    $Unattend.unattend.settings[1].component[2].ComputerName = $VMName
    $Unattend.unattend.settings[1].component[3].Interfaces.Interface.UnicastIpAddresses.IpAddress.'#text' = $VMIP
    $Unattend.unattend.settings[1].component[4].Interfaces.Interface.DNSServerSearchOrder.IpAddress.'#Text' = $DNSIP
    $Unattend.unattend.settings[1].component[3].Interfaces.Interface.Routes.Route.NextHopAddress = $GWIP
    $Unattend.Save("${VHD}:\\Unattend.xml")
    # dismount VHD
    Dismount-VHD $diskpath
  #endregion
  
  #region create new vm
    # Create VM with new VHD
    New-VM -Name $VMName -MemoryStartupBytes 2048MB -SwitchName $VMSwitch -VHDPath $diskpath -Generation 2 -BootDevice VHD
  #endregion
  
  #region start new vm and connect to console
    # Start VM
    Start-VM $VMName
    Start-Process vmconnect -ArgumentList localhost,$VMName
  #endregion
}