Local Vs Universally Administered MAC Address NIC Refuses to come up

2,6,A or E is what the second digit of your MAC address must be otherwise a lot of OS's will not work.  They will say the NIC is down/not connected even though it is.

This is because if the second digit is not set properly it will not view as a valid MAC or device uplink.  This is especially an issue with VMs whether in QEMU etc.. if you are making your own MAC.

MAC address is invalid

c4:d1:aa:e5:10:05

To fix it just change the c4 to c2, c6, ca or ce

MAC address is valid / correct

42:b9:4d:81:59:3c

46:b9:4d:81:59:3c

4a:b9:4d:81:59:3c

4e:b9:4d:81:59:3c


Tags:

vs, universally, administered, nic, refuses, digit, os, valid, uplink, vms, qemu, etc, invalid, aa, ca, ce,

Latest Articles

  • Grandstream Phone Vulnerability Security Issue Remote Backdoor Connection to 207.246.119.209:3478
  • Linux How to Check Which NIC is Onboard eth0 or eth1 Ubuntu Centos Debian Mint
  • VboxManage VirtualBox NAT Network Issues Managment Troubleshooting
  • Dell PowerEdge Server iDRAC Remote KVM/IP Default Username, Password Reset and Login Information Solution
  • Nvidia Tesla GPUs K40/K80/M40/P40/P100/V100 at home/desktop hacking, cooling, powering, cable solutions Tutorial AIO Solutions
  • Stop ls in Linux Debian Mint CentOS Ubuntu from applying quotes around filenames and directory names
  • Thunderbird Attachment Download Error Corrupt Wrong filesize of 29 or 27 bytes Solution
  • Generic IP Camera LAN Default IP Settings DVR
  • Ubuntu Debian Mint Linux How To Update Initramfs Manually update-initramfs
  • Enable Turbo Mode for CPU Ubuntu Linux Mint Debian Redhat
  • docker / kubernetes breaks Proxmox QEMU KVM Bridge VMs
  • How To Change Storage Location in Docker.io
  • RTL8812BU and RTL8822BU Linux Driver Ubuntu Setup Archer T3U Plus
  • Kazam video blank/high size and not working when recording solution
  • Cisco UC CME How To Enable Licensed Features
  • from pip._internal.cli.main import main File "/usr/local/lib/python3.5/dist-packages/pip/_internal/cli/main.py", line 60 sys.stderr.write(f"ERROR: {exc}") from pip._internal.cli.main import main File "/usr/local/lib/python3.5/dist-packag
  • ModuleNotFoundError: No module named 'pip._internal' solution python
  • grub blank screen how to manually boot kernel and initrd Linux Ubuntu Debian Centos won't boot solution
  • Cisco Switch / Router How To Restore Factory Default Settings
  • Cisco 2900 3900 Router Password Reset How To Reset Enable Password