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,

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