Network interfaces do not come up and ifconfig does not show all interfaces

Solution Verified - Updated -

Issue

  • Network interfaces do not come up and ifconfig does not show all interfaces
  • ifconfig -a is missing some devices/interfaces

  • ifup fails with error:

    # ifup <INTERFACE>
<INTERFACE>: unknown interface: No such device

Environment

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

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