C# - Finding my machine's local IP Address and not the VM's

Question

I have a VirtualBox VM installed on my machine and as such there is an ethernet adapter that appears for it. I'm enumerating through the list of my machine's IP address via the following:

       public string GetLocalIpAddress()
       {
            try
            {
                string strHostName = Dns.GetHostName();

                // Then using host name, get the IP address list..
                IPHostEntry ipEntry = Dns.GetHostEntry(strHostName);

                foreach (IPAddress ip in ipEntry.AddressList)
                {
                    if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                    {
                        return string.Format("({0})", ip.ToString());
                    }
                }
            }
            catch(Exception e)
            {
                Global.ApplicationLog.AddApplicationLog(EnumAppEventTypes.SYSTEM_ERROR, e.ToString());
            }

            return "";
        }

My problem is that the virtual machine's ethernet adapter also catches on the condition:

if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)

Is there a way of picking out my machine's local ip address and disregarding my virtual machine's?

Answer 1

I'm refining Andrej Arh's answer, as the IP Address reported by GatewayAddresses can also be "0.0.0.0" instead of just null:

    public static string GetPhysicalIPAdress()
    {
        foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
        {
            var addr = ni.GetIPProperties().GatewayAddresses.FirstOrDefault();
            if (addr != null && !addr.Address.ToString().Equals("0.0.0.0"))
            {
                if (ni.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 || ni.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
                {
                    foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
                    {
                        if (ip.Address.AddressFamily == AddressFamily.InterNetwork)
                        {
                            return ip.Address.ToString();
                        }
                    }
                }
            }
        }
        return String.Empty;
    }

Answer 2

Use WMI and check ConnectorPresent property for physical device.

public static string GetPhysicalIPAdress()
{
    foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
    {
        if (ConnectorPresent(ni))
        {
            if (ni.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 || ni.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
            {
                foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
                {
                    if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                    {
                        return ip.Address.ToString();
                    }
                }
            }
        }
    }
    return string.Empty;
}

private static bool ConnectorPresent(NetworkInterface ni)
{
    ManagementScope scope = new ManagementScope(@"\\localhost\root\StandardCimv2");
    ObjectQuery query = new ObjectQuery(String.Format(
        @"SELECT * FROM MSFT_NetAdapter WHERE ConnectorPresent = True AND DeviceID = '{0}'", ni.Id));
    ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
    ManagementObjectCollection result = searcher.Get();
    return result.Count > 0;
}

Answer 3

There is one option. VM IP don't have Default Gateway, so, exclude all IP's without Default Gateway.

foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
{
    var addr = ni.GetIPProperties().GatewayAddresses.FirstOrDefault();
    if (addr != null)
    {
        if (ni.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 || ni.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
        {
            Console.WriteLine(ni.Name);
            foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
            {
                if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                {
                    Console.WriteLine(ip.Address.ToString());
                }
            }
        }
    }
}

Answer 4

You can disregard the Ethernet adapter by its name. As the VM Ethernet adapter is represented by a valid NIC driver, it is fully equivalent to the physical NIC of your machine from the OS's point of view.