CODEWITHSUNDEEP
c#
user884248
user884248

Reputation: 2244

C#: How do I retrieve only network interfaces attached to physical network cards?

In my C# program, I need to enumerate all network interfaces which are actual network cards (Wifi or Ethernet), meaning - the ones connected to actual physical devices, as opposed to VPN connections, etc.

I'm using NetworkInterface.GetAllNetworkInterfaces() to enumerate NetworkInterfaces, but I don't know how to filter those for physical devices...

Upvotes: 3

Views: 3382

Answers (3)

Shannon
Shannon

Reputation: 430

The NIs with prefix "PCI" are physical NIs.

            NetworkInterface[] fNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface adapter in fNetworkInterfaces)
            {
                string fRegistryKey = "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}\\" + adapter.Id + "\\Connection";
                RegistryKey rk = Registry.LocalMachine.OpenSubKey(fRegistryKey, false);
                if (rk != null)
                { 
                    string fPnpInstanceID = rk.GetValue("PnpInstanceID", "").ToString();
                    int fMediaSubType = Convert.ToInt32(rk.GetValue("MediaSubType", 0));
                    if (fPnpInstanceID.Length > 3 && fPnpInstanceID.Substring(0, 3) == "PCI")
                    {

                    }
                }
            }

Upvotes: 3

Jake1164
Jake1164

Reputation: 12369

You will have to dig though all the provided info, however, the Win32_NetworkAdapterConfiguration class will give you info about the configuration of your adapters e.g. ip addresses etc and the Win32_NetworkAdapter class provides 'static' information about each adapter (max speed, manufacturer etc).

string query = "SELECT * FROM Win32_NetworkAdapterConfiguration";
ManagementObjectSearcher moSearch = new ManagementObjectSearcher(query);
ManagementObjectCollection moCollection = moSearch.Get();// Every record in this collection is a network interface

foreach (ManagementObject mo in moCollection)
{
    // ....
}

Upvotes: 0

Jake1164
Jake1164

Reputation: 12369

You need to use the NetworkInterfaceType Enumeration.

The docs include a pretty decent example for figuring this out.

 public static void DisplayTypeAndAddress()
{
    IPGlobalProperties computerProperties = IPGlobalProperties.GetIPGlobalProperties();
    NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
    Console.WriteLine("Interface information for {0}.{1}     ",
            computerProperties.HostName, computerProperties.DomainName);
    foreach (NetworkInterface adapter in nics)
    {
        IPInterfaceProperties properties = adapter.GetIPProperties();
        Console.WriteLine(adapter.Description);
        Console.WriteLine(String.Empty.PadLeft(adapter.Description.Length,'='));
        Console.WriteLine("  Interface type .......................... : {0}", adapter.NetworkInterfaceType);
        Console.WriteLine("  Physical Address ........................ : {0}", 
                   adapter.GetPhysicalAddress().ToString());
        Console.WriteLine("  Minimum Speed............................ : {0}", adapter.Speed);
        Console.WriteLine("  Is receive only.......................... : {0}", adapter.IsReceiveOnly);
        Console.WriteLine("  Multicast................................ : {0}", adapter.SupportsMulticast);
        Console.WriteLine();
      }
   }

Upvotes: 0

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