Can NetworkManager disable default gateway when creating interfaces?

Solution Verified - Updated -

Issue

  • We note that by default all new connections are created with ipv4.never-default no (DEFROUTE=yes).
  • This means that NetworkManager will move the default route to other interfaces created later causing the actual gateway of the host to be unreachable which is undesireable.
  • Is there a way to make connections default to ipv4.never-default yes (DEFROUTE=no) for all new connections created so forth with NetworkManager?
  • Is it possible to configure or change the NetworkManager default connection settings?

Environment

  • Red Hat Enterprise Linux (RHEL)
    • 7
    • 8
  • NetworkManager nmcli

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