Duplicate MAC address on second node

[hastime]

Hi all,

I have been running one proxmox node on my network for about a year and I have decided that it is time to add another, I have an identical machine.

After installing proxmox on the second machine I have noticed that it has the same MAC address as the first node I built. Both were configured off the network and then connected after, although the second one has not been connected because I noticed the duplicate MAC during setup and I don't want to cause any routing issues on my network with static IPs etc.

My many questions are, have I been incredibly unlucky and ended up with two NICs with the same MAC? Does ProxMox spoof the MAC of the host during the installation on the bare metal? Is this something I can fix?

I noticed that before launching the GUI install ProxMox does discovery on all the NICs - is the problem caused by not being on the network at this point?

Sorry for all the questions! Thanks in advance,

Has

 

[leesteken]

I think you can set a different MAC using hwaddress in /etc/network/interfaces.
Can you to provide the first three pairs of digits (that specify the vendor) and the make and model of the network devices?
Maybe you're unlucky (1 in 16.7 million with a vendor that recycles their IDs too soon) or maybe the hardware is fake (as in not produced by the actual company and probably much cheaper and lower quality).
I'm assuming you did not set the MAC yourself after the installation or running Proxmox inside a VM? Sometimes a BIOS update can ruin the onboard MAC but it's rare (and can be fixed in the BIOS probably)..

 

[hastime]

I think you can set a different MAC using hwaddress in /etc/network/interfaces.
Can you to provide the first three pairs of digits (that specify the vendor) and the make and model of the network devices?
Maybe you're unlucky (1 in 16.7 million with a vendor that recycles their IDs too soon) or maybe the hardware is fake (as in not produced by the actual company and probably much cheaper and lower quality).
I'm assuming you did not set the MAC yourself after the installation or running Proxmox inside a VM? Sometimes a BIOS update can ruin the onboard MAC but it's rare (and can be fixed in the BIOS probably)..

Thanks for the reply!


I had thought about changing the headdress in .../interfaces. But I also wanted to understand if it was caused by a bug or by a mistake I was making during deployment first. I have not set the MAC myself and proxmox is not running in a VM it is installed onto the bare metal machines. You can see the duplicate MAC first displayed when setting the fqdn and IP settings when running the setup iso.

The first three pairs of numbers are a4:1f:72 - this is the onboard 1GB Ethernet port and they are two dell vostro 270 towers.

Thanks,

Has