Using the ethtool utility one cannot set autoneg off for ethernet cards

Solution Verified - Updated -

Issue

  • When trying to set auto-negotiation off on a gigabit ethernet card, the following error pops up, why ?

    # ethtool -s eth1 autoneg off 
    Cannot set new settings: Invalid argument 
    not setting autoneg
    
  • We need to speed and duplex values and Link Speed for 10G NIC on RHEL. However the settings are not getting accepted.

Environment

  • Red Hat Enterprise Linux (RHEL) (all versions)
  • Network card at 1Gbps or 10Gbps or faster

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