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How to write a NetworkManager dispatcher script to apply ethtool commands?

Solution Verified - Updated 2018-08-30T16:04:38+00:00 -

Issue

How to write a NetworkManager dispatcher script to apply ethtool commands?
Need to apply ethtool offloading to a network interface at boot or startup?
What is the correct syntax for a NM dispatcher script to enable or disable offloading like checksumming or large receive (GSO/LRO) or segmentation (GRO/LSO)?

Environment

Red Hat Enterprise Linux 7
NetworkManager used to manage network connections
Network interface supporting configurable offload via ethtool -K commands

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