How to make NIC ethtool settings persistent (apply automatically at boot)

Solution Verified - Updated -

Issue

  • Need to make a setting change with ethtool always apply at boot time or when the network interface is brought up.
  • Need to set NIC ring buffer size permanently.
  • Want to have a NIC offloading feature such as TSO, GSO, LRO, or GRO, etc, enabled or disabled all the time.

Environment

  • Red Hat Enterprise Linux
  • ethtool
  • initscripts
  • NetworkManager

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