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POHow to reliably get the computer's on-board network adapter's MAC address?
 

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  1. POHow to reliably get the computer's on-board network adapter's MAC address?
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    <p>I am trying to (more or less) uniquely identify a system for licensing purposes. I have chosen the computer's on-board network adapter's MAC address for this task, since I can be sure that every cmputer running this software actually has one, and this avoids re-activation when changing e.g. the harddrive.</p> <p>I am having troubles reliably identifying the onboard network adapter, though. </p> <p>Using the "Win32_NetworkAdapterConfiguration" ManagementClass, I can get a whole lot of MAC Addresses, including the address I like, but I have not found a way to distinguish the onboard one from virtual adapters installed by Windows or Virus Scanners. This list seems to be ordered, though. The MAC Address I am interested in is (on my machine) listed before other (real) network adapters. (The list is ordered by interface index.)</p> <p>Using <code>NetworkInterface.GetAllNetworkInterfaces()</code>, I think I can identify the real network adapters by filtering on <code>.NetworkInterfaceType == NetworkInterfaceType.Ethernet</code>, but this list seems to be unordered (an added network card appears before the onboards one).</p> <p>Is first using the second method to get a list of real networks cards and then sorting them by the order of appearence in the first list a reliable way of identifying the MAC address I am looking for? Can the interface index in the first list change? I'd be happy to hear your thoughts!</p> <p>Thanks!</p> <p>P.S.: I know that the MAC address can be rather easily changed, but I can live with that. I cannot live with the customer not being able to use the software after simply inserting a WLAN stick =)</p>
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      1. POHow to reliably get the computer's on-board network adapter's MAC address?
      1. USDimi Toulakis
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    1. COWhy not cache all MAC addresses of interfacetype ethernet?
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      1. USRalf de Kleine
    2. CO@rdkleine: This would break the activation if another network adapter is added.
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    3. COYou could compare all adapters with all the cached ones. One pair is enough, right?
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      1. USRalf de Kleine
 

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