Unable to add the default gateway using NetworkManager.

Solution In Progress - Updated -

Issue

  • NetworkManager is failing to add default gateway.
  • Adding the default gateway is failing with below error:
 NetworkManager[10726]: <warn>  [1578888969.4798] platform: route-sync: failure to add IPv4 route: 0.0.0.0/0 via 192.0.2.221 dev 2 metric 100 mss 0 rt-src user: Invalid argument (22)

Environment

  • Red Hat Enterprise Linux (RHEL)
  • NetworkManager

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