Is it possible to change the NIC speed and duplex for fiber network interface card?

Solution Unverified - Updated -

Issue

  • Is it possible to change speed and duplex setting of fiber NIC card?
  • How can I change speed and duplex setting of fiber NIC card?
  • I am seeing below error while changing speed and duplex setting of fiber NIC card?
# ethtool -s ethX autoneg off  speed 100
Cannot set new settings: Invalid argument
-------------------------------------------------------------
# ethtool -s ethX speed 100
Cannot set new settings: Invalid argument

Environment

  • Red Hat Enterprise Linux (All Version).

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