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

  • Debian Ubuntu Mint Howto Create Bridge (br0)
  • How To Control Interface that dhcpd server listens to on Debian based Linux like Mint and Ubuntu
  • LUKS unable to type password to unlock during boot on Debian, Ubuntu and Mint
  • Debian Ubuntu and Linux Mint Broken Kernel After Date - New Extra Module Naming Convention
  • Wordpress overwrites and wipes out custom htaccess rules and changes soluton
  • Apache htaccess and mod_rewrite how to redirect and force all URLs and visitors to the SSL / HTTPS version
  • python 3 pip cannot install mysql module
  • QEMU-KVM won't boot Windows 2016 or 2019 server on an Intel Core i3
  • Virtualbox vbox not starting "No suitable module for running kernel found"
  • Bind / named not responding to queries solution
  • Linux Mint How To Set Desktop Background Image From Bash Prompt CLI
  • ImageMagick Convert PDF Not Authorized
  • ImageMagick Converted PDF to JPEG some files have a black background solution
  • Linux Mint Mate Customize the Lock screen messages and hide username and real name
  • Ubuntu/Gnome/Mint/Centos How To Take a partial screenshot
  • ssh how to verify your host key / avoid MIM attacks
  • Cisco IP Phone CP-8845 8800/8900 Series How To Reset To Factory Settings Instructions
  • ls how to list ONLY directories
  • How to encrypt your SSH private key file id_rsa
  • Linux Mint 18 Disable User Name List from showing on Login Screen