What are the different NetworkManager device states and reason codes and what do they mean?

Solution Verified - Updated -

Issue

  • What are the different NetworkManager device states and what do they mean?
  • What are the different NetworkManager reason codes and what do they mean?
  • NetworkManager reports device states and reason codes in the /var/log/messages file but it is not clear what they are.

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • NetworkManager

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