TAP Adapter version 9.24 BUG

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vjodulio
OpenVpn Newbie
Posts: 2
Joined: Tue Apr 11, 2023 2:29 pm

TAP Adapter version 9.24 BUG

Post by vjodulio » Tue Apr 11, 2023 4:03 pm

Scenario: To use the physical ethernet adapter's MAC address with the TAP Adapter

Result: After assigning the physical ethernet adapter's MAC address with the TAP Adapter, we verify it on our DHCP Server that the MAC address of the TAP Adapter registered is the TAP Adapter's MAC address and not the Physical ethernet adapter's MAC address. This works as expected with an older version of TAP Adapter that is included in OpenVPN version 2.4.4.

We can not use the latest version of OpenVPN with our solution because of this issue.

vjodulio
OpenVpn Newbie
Posts: 2
Joined: Tue Apr 11, 2023 2:29 pm

Re: TAP Adapter version 9.24 BUG

Post by vjodulio » Fri Apr 14, 2023 12:43 pm

Is there anyone that can help with this issue?

becm
OpenVPN User
Posts: 37
Joined: Tue Sep 01, 2020 1:27 pm

Re: TAP Adapter version 9.24 BUG

Post by becm » Thu May 04, 2023 10:06 pm

The setting of user values is (to a degree) still discussed on GitHub issue.
Sounds like the MAC is required to be a "locally administered address" (bit 2 of byte 1 is set) due to Windows driver signing restrictions (?).

A workaround for you may be to change BOTH (TAP and physical MACs) to a valid user-assigned value (current drivers should support this).

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