Not possible to disable auto negotiation on 1000 interface

Solution Verified - Updated -

Issue

  • Not able to disable auto negotiation on 1000BASE interface. Error message:

    Cannot set new settings: Invalid argument - not setting speed, not setting duplex, not setting autoneg.

  • ethtool -s ethX speed 1000 autoneg off command does not work

  • Unable to set network speed to 1GBs

Environment

  • Red Hat Enterprise Linux
  • Ethernet interface supporting multiple speeds such as 1Gbps or 10Gbps

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