NetworkManager unable to set MTU (Jumbo frames) for interfaces using igb modules in RHEL7

Solution In Progress - Updated -

Issue

  • There is no way to change the MTU of the interface using the igb module with NetworkManager. It also ignores the value if set in the ifcfg file. However, the same works if set with the ip command or with NetworkManager disabled

Environment

  • Red Hat Enterprise Linux 7.x
  • NetworkManager <= 1.0.0-16.git20150121.b4ea599c
  • Intel Corporation I350 Gigabit Network Connection
    • igb version 5.2.13-k

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