Different MTUs at different VLANs.


Reini

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I got a new unRAID system with a 2x 10GB NIC for 802.3ad bonding as a single trunk (bond0).

Have also configured 3 VLANs and want to configure the MTU of one of these to 9000 (jumbo frames).

It is possible to set the MTU to 9000 on the interface (default VLAN at br0) itself.

But I couldn't find out how to set the MTU only on the 2nd VLAN (br0.777) to 9000 and leave the other both VLANs (br0 and br0.666) to MTU 1500.

(Have already set up different Linux-Systems with this settings successfully)

It would be great if anybody has any idea how to configure it at unRAID.

Thanks in advance.

Edited by Reini
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6 hours ago, bonienl said:

VLANs follow the MTU size set for the physical interface. It is not possible to assign different MTU sizes per VLAN on the same interface.

You mean it's not possible to configure it over the unRAID GUI - correct?

Because on OS level, it is possible to configure different MTU sizes at different VLANs on the same physical interface.

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The GUI supports MTU size setting on a physical interface, which is automatically propagated to the associated VLAN interfaces.

I have never tried it, but it should be possible to assign each VLAN its own MTU size using CLI.

The restriction is that a VLAN MTU size can never be bigger than the MTU size of the physical interface.

 

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  • 2 years later...

Where do we put a feature request for this? :)

 

The use case is you don't even put an IP on the physical interface, it's only a carrier with the highest MTU possible. Then you create VLANs for the different services.

 

For unraid it would be:

- physical interface: MTU=1500

- regular use (content consumption): MTU=1500

- NAS network for home lab: MTU=9000

 

Those VLANs must support any of all the parameters you're supposed to define to a interface.

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  • 1 year later...
On 2/18/2019 at 4:16 PM, Reini said:

You mean it's not possible to configure it over the unRAID GUI - correct?

Because on OS level, it is possible to configure different MTU sizes at different VLANs on the same physical interface.

 

Hi Reini,

 

can you please discribe how to do this --> on OS level, it is possible to configure different MTU sizes at different VLANs

 

cYa BUSTER

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