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Hyper-V changes the MAC-Address of its "vEthernet (Default Switch)" on every Windows boot.

I can manually set it back in the "Hyper-V Virtual Ethernet Adapter Properties" under Advanced/Network Address after every boot but i'm looking for a way to tell Hyper-V to use a static MAC or the last used MAC instead.

I believe this guy here has a similar problem.

jesses
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  • AFAIK, the Default switch is not customizable and has no significance for the Windows host - it's sole purpose is to provide a virtual internet link between the WAN connected interface on the Windows host and the Default adapter in order to provide internet access to a client VM. – JW0914 Nov 09 '20 at 15:06
  • @JW0914 I have a very old SW whose License is mac address based and which checks the first adapter of the host and unfortunately this is the Hyper-Vs' default switch. – jesses Nov 09 '20 at 15:30
  • you may be able to modify what Windows considers the first adapter via the registry. Is it simply going off the first letter in the adapter's name _(i.e. would renaming the Default adapter to `vDefault` work)_? If the latter works, you'll have to rename it after every bi-annual update or whenever a Hyper-V update is pushed – JW0914 Nov 09 '20 at 15:34

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