Standardgateway bei Clients mit statischer IP Adresse ändern

QUELLE für nachfolgendes: https://www.virtualizationhowto.com/2016/09/change-default-gateway-powershell/

#variables
$ipaddress='1.2.3.4'  
$index = get-netipaddress | where-object {$_.IPAddress -eq $ipaddress} | select -ExpandProperty InterfaceIndex
$Log = 'c:\windows\options\gateway\gatewaychange.log'  
$gateway = get-netroute -DestinationPrefix '0.0.0.0/0' | select -ExpandProperty NextHop  
$oldroute = '1.1.1.1'  
$newroute = '2.2.2.2'  
$destination = '0.0.0.0/0'  

#Start Changing the Gateway if needed

Function Swap-Gateway() {

remove-netroute -interfaceindex $index -NextHop $oldroute -confirm:$false
new-netroute -interfaceindex $index -NextHop $newroute -destinationprefix $destination -confirm:$false
sleep 3

}

if ($gateway -eq $oldroute) {
Write-Warning -Message "Gateway is set to $gateway and will be changed to $newroute"  
Swap-Gateway | Out-file $Log -Append

}
elseif ($gateway -eq $newroute) {
Write-Warning -Message "Gateway is already set to $newroute and needs no change"  

}

$NewGW = '192.168.120.1' # Hier Dein neues Standardgateway eintragen  
$DestPrefix = '0.0.0.0/0'  
$ifindex = Get-NetIPConfiguration |  Select -ExpandProperty Interfaceindex
Remove-NetRoute -InterfaceIndex $ifindex -confirm:$false
New-NetRoute -InterfaceIndex $ifindex -NextHop $NewGW -DestinationPrefix $DestPrefix

Get-NetipConfiguration # Config ausgeben

$NewGW = '192.168.120.1'  

$IFAlias = 'Ethernet'  

$DestPrefix = '0.0.0.0/0'  
$ifindex = Get-NetIPConfiguration | Where-Object {$_.InterfaceAlias -eq $IFAlias} | Select -ExpandProperty Interfaceindex
Remove-NetRoute -InterfaceIndex $ifindex -confirm:$false
New-NetRoute -InterfaceIndex $ifindex -NextHop $NewGW -DestinationPrefix $DestPrefix
Get-NetipConfiguration

Get-NetRoute -DestinationPrefix 0.0.0.0/0 -NextHop 192.168.20.9 -EA SilentlyContinue | Remove-NetRoute -Confirm:$false -PassThru | New-NetRoute -DestinationPrefix 0.0.0.0/0 -NextHop 192.168.20.40

gwmi win32_NetworkadapterConfiguration | ?{$_.DefaultIPGateway -eq '192.168.20.9'} | %{$_.SetGateways('192.168.20.40')}