Determinar si una NIC tiene acceso a Internet (vs local, red cerrada)

El Test-Connection cmdlet le permite especificar la dirección de origen con el -Source parámetro. Podemos probar las direcciones utilizado por cada adaptador.

$adapters = Get-NetIPAddress -AddressFamily ipv4 | Where-Object InterfaceAlias -in (Get-NetAdapter | Select-Object -ExpandProperty Name) | Select-Object IPAddress,InterfaceAlias

$adapters | % {

    Test-Connection -Source $_.IPAddress -Destination 8.8.8.8 -ErrorAction SilentlyContinue | Out-Null

    if($?) {
        write-host $_.InterfaceAlias "(" $_.IPAddress ") can connect to the internet."
    }
    else {
        write-host $_.InterfaceAlias "(" $_.IPAddress ") failed to connect to the internet."
    }

}

Salida:

Local Area Connection ( 10.1.1.2 ) can connect to the internet
Ethernet 2 ( 10.1.1.3 ) failed to connect to the internet.
Wireless Network Connection ( 10.1.1.4 ) failed to connect to the internet.