function set-ethmetric
{
[CmdletBinding()]
Param
(
    [Parameter(Mandatory=$false)]
    [int]$Metric,
    [Parameter(Mandatory=$false)]
    [ValidateSet("Auto")]
    [string]$AutoMetric = 'Auto'

)
    if ($Metric -eq $Null)
        {$met = $AutoMetric}
    else {$met = $Metric}
    $adapter = Get-WmiObject -Class win32_networkAdapter | Where-Object Name -Like '*Ethernet*'

    # Change IPv4 metric
    $Adapterstring_ipv4 = 'netsh interface ipv4 set interface "' + $adapter.NetConnectionID +'" metric=' +$met
    cmd.exe /C $Adapterstring_ipv4
    # Change IPv6 metric
    $Adapterstring_ipv6 = 'netsh interface ipv6 set interface "' + $adapter.NetConnectionID +'" metric=' +$met
    cmd.exe /C $Adapterstring_ipv6


}


set-ethmetric -Metric 51