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[6.12.14] No network after updating, eth0 assigned to virtual USB-NIC "CDC Ethernet Device" with 169 IP instead of Mellanox 10Gbe NIC

  • Minor

Coming from 6.12.13 - everything was working fine, but after upgrading to 6.12.14 I lost network.  No hardware changes. 

 

My AsRockRack E3C246D4U motherboard has 2 onboard LAN ethernet NICs which are both disabled in BIOS. I have a Mellanox ConnectX-3 EN (MCX311A-XCAT) 10Gbe PCIe NIC installed (single port) which is what unraid should be using for network.  However, in 6.12.14, Unraid has assigned eth0 to some USB NIC device I've never heard of called "CDC Ethernet Device" while it assigns my Mellanox NIC to eth1.  (Screenshot from IPMI KVM below)

image.png.ce72b1cda82702e1ed9b6d1c7c448a1d.png

 

In the previous OS version (6.12.13), the Mellanox 10Gbe NIC is automatically assigned to eth0 and the virtual USB NIC device is disabled:

image.png.57a28556daa1acc5b6ddbbcbe25df71e.png

 

There is definitely no physical USB ethernet adapters connected to the server.  Maybe this is a red herring, but my best guess is that this is a virtual device that is there for IPMI KVM redirection purposes??  I found a support thread from another user mentioning the same type of "cdc_ether" device and for them it ended up being related to their Dell iDRAC (Dell's IPMI implementation) "OS TO IDRAC PASS THROUGH" feature, which they disabled and that fixed their problem.  I have looked all through the BMC Settings in the BIOS as well as in AsRockRack's HTML5 IPMI KVM tool and I can't find anything relating to USB NIC pass-through (there is pass-through settings but only for virtual floppy/optical/harddisk).  

 

There is no network-rules.cfg file in /boot/config and therefore no Interface Rules section in Network Settings in the GUI so I am unable to manually assign the Mellanox 10Gbe NIC to eth0.  I tried to rename /boot/config/network.cfg and reboot, but this didn't fix it.  In Network Settings, I tried to disable bonding and bridging on the eth0 USB NIC and reboot but that didn't work either.  I also tried rebooting into Safe Mode to ensure it wasn't a plugin but the issue persists.  I then rolled back to previous version and everything was working again.  This is reproducable by rolling back and then updating again.

 

I have attached Diagnostics.  Appreciate any assistance!

tower-diagnostics-20241209-1707 safe mode.zip

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