How to persist Private flags for an interface

Hi All,

We have a requirement to turn ON “disable_mc_loopback” private flag for an interface. I could do the same by using below command,

ethtool --set-priv-flags disable_mc_loopback on

However the configuration does not persist reboot. Is their a way to persist the above configuration?

We are using the following Ethernet Controller - Mellanox Technologies MT27500/MT27520 Family [ConnectX-3/ConnectX-3 Pro Virtual Function]

Use ifcfg- file and specify ETHTOOL_OPTS parameter.

$cd /etc/sysconfig/network-scripts

$:/etc/sysconfig/network-scripts/>grep ETHTOOL *

network-functions: [ -n “${ETHTOOL_DELAY}” ] && /bin/usleep ${ETHTOOL_DELAY}

network-functions: for opts in $ETHTOOL_OPTS ; do


The instructions above applicable for RedHat/CentOS. For the other distributions, need to use similar way and add call to ‘ethtool’ from interface startup script. For additional details, contact your OS vendor.