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    10gbit interface compatibility (Intel X553 <-> Mellanox ConnectX-2)

    I had such problem too with Supermicro (intel x553) adapter. I found that kernel module 'ixgbe' have parameter: allow_unsupported_sfp. So... # rmmod ixgbe # echo "options ixgbe allow_unsupported_sfp=1" > /etc/modprobe.d/ixgbe.conf # modprobe ixgbe Now connection works with my Cisco DAC