What does each flag represents in "ifconfig" and "ip link" commands?

Solution Verified - Updated -

Issue

  • What does each item in the output of ifconfig mean?
  • What does each flag represents in ifconfig and ip link commands?
  • What does LOWER_UP, NO-CARRIER flags mean ?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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