Converts an existing DHCP address configuration to a local static IP configuration

ConvertFrom-DHCPToStatic.ps1

function ConvertFrom-DHCPToStatic {
    <#
    .SYNOPSIS
        This script takes an existing DHCP configuration and converts it to a static IP configuration
    .DESCRIPTION
        The script uses several functions to retrieve the necessary data from the existing configuration, 
        removes that configuration, and installs the new configuration.
    .NOTES
        This script was built with the idea that there will only be one "physical" NIC in the server that is up and 
        running when the script is run.  It has not been tested in other scenarios
    .EXAMPLE
        PS C:\> ConvertFrom-DHCPToStatic -Verbose
        VERBOSE: Running from the console; proceeding with the script
        VERBOSE: The Adapter Config is:
        @{Name=Ethernet 2; ifIndex=3; MacAddress=3E-DD-2D-E2-AF-63}
        VERBOSE: The SubnetMask is 24, and the IPAddress Family is IPv4
        VERBOSE: The IPConfiguration is
        @{IPaddress=10.207.221.92; PrefixLength=24}
        VERBOSE: Removing the existing configuration
        VERBOSE: Setting the Adapter's ip configuration

        IPAddress         : 10.207.221.92
        InterfaceIndex    : 3
        InterfaceAlias    : Ethernet 2
        AddressFamily     : IPv4
        Type              : Unicast
        PrefixLength      : 24
        PrefixOrigin      : Manual
        SuffixOrigin      : Manual
        AddressState      : Tentative
        ValidLifetime     : Infinite ([TimeSpan]::MaxValue)
        PreferredLifetime : Infinite ([TimeSpan]::MaxValue)
        SkipAsSource      : False
        PolicyStore       : ActiveStore

        IPAddress         : 10.207.221.92
        InterfaceIndex    : 3
        InterfaceAlias    : Ethernet 2
        AddressFamily     : IPv4
        Type              : Unicast
        PrefixLength      : 24
        PrefixOrigin      : Manual
        SuffixOrigin      : Manual
        AddressState      : Invalid
        ValidLifetime     : Infinite ([TimeSpan]::MaxValue)
        PreferredLifetime : Infinite ([TimeSpan]::MaxValue)
        SkipAsSource      : False
        PolicyStore       : PersistentStore
        VERBOSE: Setting the Adapter's DNS configuration
    #>
    
    
    [cmdletbinding()]
    param()

    $VolatileEnviorment = Get-Item -Path 'Registry::HKEY_CURRENT_USER\Volatile Environment'
    $SessionKey         = $VolatileEnviorment.GetSubKeyNames() 
    $MySessionName      = (Get-ItemProperty -Path ('Registry::HKEY_CURRENT_USER\Volatile Environment\{0}' -f $SessionKey) -Name SESSIONNAME).SESSIONNAME
    if ($MySessionName -ne 'Console') {
        Write-Warning 'Not on the console session, not proceeding; this script should not be run through an RDP session'
        return 
    }
    else {
        Write-Verbose -Message 'Running from the console; proceeding with the script'
    }
    $Adapter 	= Get-NetAdapter -Physical | Where-Object Status -eq 'Up'
    $Message    = 'The Adapter Config is:{0}{1}' -f [System.Environment]::NewLine, ($($Adapter | Select-Object -Property Name,ifIndex, MacAddress) -join [System.Environment]::NewLine)
    Write-Verbose -Message $Message 

    $NetIP 		= Get-NetIPAddress -InterfaceIndex $Adapter.InterfaceIndex 
    $Message    = 'The SubnetMask is {0}, and the IPAddress Family is {1}' -f $NetIP.PrefixLength, $NetIP.AddressFamily
    Write-Verbose -Message $Message
    
    $IPConfig 	= Get-NetIPConfiguration -InterfaceIndex $Adapter.InterfaceIndex 
    $Message    = 'The IPConfiguration is{0}{1}' -f [System.Environment]::NewLine, $($NetIP | Select-Object -Property IPaddress, PrefixLength)
    Write-Verbose -Message $Message

    $AdapterConfig =  @{
        InterfaceIndex 	= $Adapter.InterfaceIndex
        IPAddress 		= $IPConfig.IPV4Address.IPAddress
        DefaultGateway 	= $IPConfig.IPV4DefaultGateway.NextHop
        PrefixLength	= $NetIP.PrefixLength
        AddressFamily	= $NetIP.AddressFamily
    }
    Write-Verbose -Message 'Removing the existing configuration'
    Remove-NetIPAddress -InterfaceIndex $Adapter.InterfaceIndex -Confirm:$false

    Write-Verbose -Message "Setting the Adapter's ip configuration"
    New-NetIPAddress @AdapterConfig

    $DNSConfig = @{
        InterfaceIndex  = $Adapter.InterfaceIndex 
        ServerAddress 	= $IPConfig.DNSServer.GetEnumerator().ServerAddresses
    }

    Write-Verbose -Message "Setting the Adapter's DNS configuration"
    Set-DnsClientServerAddress @DNSConfig
}