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The Win32_NetworkAdapterConfiguration class is unable to retrieve information about PPPoE (Point-to-point protocol over Ethernet) and VPN (Virtual Private Network)

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This article helps you resolve the problem where he Win32_NetworkAdapterConfiguration class is unable to retrieve information about PPPoE (Point-to-point protocol over Ethernet) and VPN (Virtual Private Network).

Applies to:   Windows Vista
Original KB number:   2549091

Symptoms

On Windows Vista and later, the Win32_NetworkAdapterConfiguration class is unable to retrieve information about a PPPoE connection and VPN connection.

If a program is designed to get the information about the dial-up connection or a virtual private network by using the Win32_NetworkAdapterConfiguration class on Windows XP, it may not work on Windows Vista and later.

For more information about the Win32_NetworkAdapterConfiguration class, see Win32_NetworkAdapterConfiguration class.

Cause

On Windows Vista and later, the Win32_NetworkAdapterConfiguration class does not create an instance for a PPPoE connection or VPN connection. Microsoft has confirmed that this to be a problem in our product.

Resolution

On Windows Vista and later, you can retrieve almost the same information as the Win32_NetworkAdapterConfigurationthe class does regarding a PPPoE connection or VPN connection by using either of the following methods. It would be highly appreciated if you consider that either of the following method is acceptable.

  1. Use the .NET Framework NetworkInterface class.

    Use the NetworkInterface.GetAllNetworkInterfaces method to get a NetworkInterface array. Then, go through the NetworkInterface array to find a NetworkInterface instance that has the NetworkInterface.NetworkInterfaceType property set as Ppp. Each value of a PPPoE or VPN connection can be retrieved by referencing each property that this instance has.

    For more information on the NetworkInterface class or the sample code for this, see NetworkInterface Class.

    For more information on each property of the NetworkInterface class, see NetworkInterface Class.

  2. Use the GetAdaptersAddresses API.

    Use the GetAdaptersAddresses API to get the IP_ADAPTER_ADDRESSES structure. Then, go through the linked list of IP_ADAPTER_ADDRESSES structures to find an element that has the IfType member set as IF_TYPE_PPP. Each value of a PPPoE or VPN connection can be retrieved by referencing each member of the element.

    For more information on the GetAdaptersAddresses API or the sample code for this, see GetAdaptersAddresses function (iphlpapi.h).

    For more information on each member of the IP_ADAPTER_ADDRESSES structure, see IP_ADAPTER_ADDRESSES_LH structure (iptypes.h).

Steps to reproduce

Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colItems = objWMIService.ExecQuery _("Select * From Win32_NetworkAdapterConfiguration Where IPEnabled = True")