How and when to restart NetworkManager

Solution Verified - Updated -

Issue

  • How and when to restart NetworkManager
  • Under what circumstances should the NetworkManager service be restarted, or not restarted?
  • How to reload NetworkManager interface config after changing ifcfg files manually?
  • How to start and stop all system networking?
  • Network interfaces do not go down when NetworkManager is stopped.
  • How to reload NetworkManager conf files after changing NetworkManager.conf or /etc/NetworkManager/conf.d/?
  • How to upgrade NetworkManager after yum update?
  • How to reload NetworkManager after restarting the D-Bus (aka messagebus or dbus.service)?

Environment

  • Red Hat Enterprise Linux 7 and later
  • NetworkManager

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