$MACAddress = "IHRE MAC-ADRESSE";
$AdditionalIP = "IHRE CLUSTER-IP";

function GetNetworkAdapterByMAC
([string] $MACAddress)
{
    $MACAddress = $MACAddress.Replace(":","").Replace(" ","").Replace("-","").ToLower();
    $NetworkAdapter = @();
    $NetworkAdapter += Get-NetAdapter  | where { $_.MACAddress.Replace(":","").Replace(" ","").Replace("-","").ToLower() -eq $MACAddress};
    
    if($NetworkAdapter.Count -gt 1)
    {
        write-host "More than one network card with specified mac address was found!";
        return $null;
    }
    elseif($NetworkAdapter.Count -lt 1)
    {
        write-host "No network card with specified mac address was found!";
        return $null;
    }
    else
    {
        return $NetworkAdapter[0];
    }
}


function IsDHCPEnabledOnMAC([Microsoft.Management.Infrastructure.CimInstance] $NIC)
{
    $IPInterface  = @();
    If($NIC -ne $null)
    {
        $IPInterface  += $NIC | Get-NetIPInterface | where {$_.ConnectionState -ne $null};
        if($IPInterface.Count -eq 1)
        {
            switch($IPInterface.Dhcp.ToString().ToLower())
            {
                "disabled" { return $false;}
                "enabled" { return $true;}
                default
                {
                    write-host "unxpected ip interface dhcp state was found!";
                    return $null;
                }
            }
        }
        else
        {
            write-host "unexpected ip interface(s) was found!";
            return $null;
        }
    }
    else
    {
        write-host "No NIC Object was given!";
        return $null;
    }
}
function Back2DHCP
([Microsoft.Management.Infrastructure.CimInstance] $NIC)
{
    Get-NetRoute -DestinationPrefix "0.0.0.0/0" | Remove-NetRoute -Confirm:$false -ErrorAction SilentlyContinue;
    $NIC | Get-NetIPAddress | Remove-NetIPAddress -Confirm:$false -ErrorAction SilentlyContinue;
    $NIC  | Set-NetIPInterface -DHCP Enabled;
    Set-DnsClientServerAddress -InterfaceIndex $NIC.InterfaceIndex -ResetServerAddresses -ErrorAction SilentlyContinue;
}

function ConvertDynamic2StaticIPConfiguration
([Microsoft.Management.Infrastructure.CimInstance] $NIC)
{
    $IPaddressConfigs = @();
    $IPaddressConfigs += $NIC | Get-NetIPConfiguration;
    if($IPaddressConfigs.Count -ne 1)
    {
        write-host "An unxpected dhcp config was found. Unable to perform further actions.";
        return $null;
    }
    $IPaddressConfig = $IPaddressConfigs[0];
    $Prefix = ($IPAddress | Get-NetIPAddress).PrefixLength;
    $DNSClientServerAddresses = $IPaddressConfig | Get-DnsClientServerAddress -AddressFamily IPv4;
    $NIC | Get-NetIPAddress | Remove-NetIPAddress -Confirm:$false;
    New-NetIPAddress -IPAddress $IPaddressConfig.IPv4Address[0].IPAddress -InterfaceIndex $NIC.InterfaceIndex -PrefixLength $Prefix -ErrorAction SilentlyContinue | Out-Null;
    if(!$?)
    {
        write-host "Unable to set static ip address.";
        Back2DHCP -NIC $NIC;
        return $false;
    }
    New-NetRoute –DestinationPrefix "0.0.0.0/0" –InterfaceIndex $NIC.InterfaceIndex –NextHop $IPaddressConfig.IPv4DefaultGateway[0].NextHop -ErrorAction SilentlyContinue | Out-Null;
    if(!$?)
    {
        write-host "Unable to set static default gateway.";
        Back2DHCP -NIC $NIC;
        return $false;
    }
    Set-DnsClientServerAddress -InterfaceIndex $NIC.InterfaceIndex -ServerAddresses $DNSClientServerAddresses.ServerAddresses -ErrorAction SilentlyContinue | Out-Null;
    if(!$?)
    {
        write-host "Unable to set static DNS server.";
        Back2DHCP -NIC $NIC;
        return $false;
    }
    return $true;
}

function AddIPToNetworkAdapter
(
[Microsoft.Management.Infrastructure.CimInstance] $NIC,
[String] $IPAddress,
[bool] $SkipAsSource = $true
)
{
    New-NetIPAddress -InterfaceIndex $NIC.InterfaceIndex -IPAddress $IPAddress -PrefixLength 32 -SkipAsSource $SkipAsSource -ErrorAction SilentlyContinue | Out-Null;
}

$NIC = GetNetworkAdapterByMAC -MACAddress $MACAddress;
If($NIC -ne $null)
{
    $DHCPEnabled = IsDHCPEnabledOnMAC -NIC $NIC;
    If($DHCPEnabled -ne $null)
    {
        If($DHCPEnabled)
        {
            $ConversionSuccess = ConvertDynamic2StaticIPConfiguration -NIC $NIC;
            if($ConversionSuccess -eq $null -or !($ConversionSuccess))
            {
                return "Unable to convert ip configuration. Manual fixing is needed.";
            }
        }
        AddIPToNetworkAdapter -NIC $NIC -IPAddress $AdditionalIP -SkisAsSource $OnlyListening;
    }
}