Why is network.service timing out?

Solution Verified - Updated -

Issue

  • The following error message was seen:

    systemd: network.service start operation timed out. Terminating.
    

Environment

  • Red Hat Enterprise Linux 7
  • NetworkManager is not in use
  • More than 75 static IP addresses defined (including virtual and alias interfaces)
    Note: It may still be possible to be affected even if the total number of static IP addresses is relatively large but less than 75
  • iputils-20160308-8.el7(RHEL7.3) or later one

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