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Thanks Erik,
                   actually i want to increase MTU of instance from
1500 to 8000,from what i know "dhcp-option-force=" will only change
MTU of vNIC and not all the interfaces related to neutron.Can this be
also changed.

On Mon, Feb 9, 2015 at 2:08 AM, Erik McCormick
<emccormick at cirrusseven.com> wrote:
> The DHCP option will only change the MTU of interfaces within the instances.
> You probably don't want to lower the bridge ibtefaces sine the point of
> lowering instance MTU is to account for GRE / VXLAN overhead going into
> those bridge interfaces. If you lower everything, you'll still be left with
> poor inter-instance communication and introduce some funky errors accessing
> SSL sites from those instances to boot.
>
> -Erik
>
> On Feb 8, 2015 3:09 PM, "mad Engineer" <themadengin33r at gmail.com> wrote:
>>
>> Hello all is there any way we can change MTU of all relevant
>> interfaces of instances,if i set
>> dhcp-option-force=26,1400 will it change MTU of all relevant
>> interfaces like qbr qvo br-int etc etc
>> is there any way to change MTU of all neutron interfaces.
>>
>> Thanks
>>
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