How to determine MAC Address of the actual physical network card — not virtual network interfaces created by VPN's (.NET C#)

Question

Background

I\'m trying to get obtain a unique identifier out of a computer and want to be able to reliably return the same MAC address each time. Trust me I have

Answer 1

This is my method: it uses the fact that physical card is connected to PCI interface

ManagementObjectSearcher searcher = new ManagementObjectSearcher
    ("Select MACAddress,PNPDeviceID FROM Win32_NetworkAdapter WHERE MACAddress IS NOT NULL AND PNPDeviceID IS NOT NULL");
ManagementObjectCollection mObject = searcher.Get();

foreach (ManagementObject obj in mObject)
{
    string pnp = obj["PNPDeviceID"].ToString();
    if (pnp.Contains("PCI\\"))
    {
        string mac = obj["MACAddress"].ToString();
        mac = mac.Replace(":", string.Empty);
        return mac;
    }
}