ixgbe SFP+ 82599ES mtu higher than 1500 ERROR

Hello

I have an Intel server with Ubuntu 16.04.2

02:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

02:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

I am unable to set mtu to a value higher than 1500, the error I get is:

SIOCSIFMTU: Invalid argument

I have downloaded and installed driver 4.6.4 and 5.0.4 and both DO NOT WORK

I have kernel

4.8.0-49-generic #52~16.04.1-Ubuntu SMP Thu Apr 20 10:55:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

I have tried issuing the following commands:

ethtool -K eno4 rx-vlan-filter off

ethtool -K eno3 rxvlan off

ethtool -K eno3 txvlan off

But still cannot set the mtu to a different value.

Can anybody help?

Thanks