How do you set the Network Card MTU for Jumbo Frames?

English Network/Internet
1

How do you set the MTU on the network card for Jumbo Frames? The MTU drop drown only goes to 1500 which is far from the Jumbo frame rate of 9000. If I type 9000 in will it blow anything up?

Sorry…I’m new to Linux so be gentle.

Joe

2

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Something like:

> sudo ip link set dev eth0 mtu 9000

I tried this once a while ago and my laptop, while plugged into a gigabit
network, would only allow me to go to 7K-ish frames. Never bothered to
figure out why, but there you go. This setting is likely not permanent so
from there you probably need to somehow use Yast (or modify
/etc/sysconfig/network/ifcfg-eth0 or whichever file) to have the MTU in
there. This is all assuming your segment can handle these frames and it
is in your best interest to allow them.

Good luck.

On 05/13/2011 02:36 PM, jcavallaro wrote:
>
> How do you set the MTU on the network card for Jumbo Frames? The MTU
> drop drown only goes to 1500 which is far from the Jumbo frame rate of
> 9000. If I type 9000 in will it blow anything up?
>
> Sorry…I’m new to Linux so be gentle.
>
> Joe
>
>
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3

If you are using ifup, then the file to edit for eth0 is /etc/sysconfig/network/ifcfg-eth0 and you will find a MTU= line there.

4

On Fri May 13 2011 06:36 pm, ken yap wrote:

>
> If you are using ifup, then the file to edit for eth0 is
> /etc/sysconfig/network/ifcfg-eth0 and you will find a MTU= line there.
>
Joe;

This file can be edited via YaST. YaST>System>/etc/sysconfig Editor. Expand
Hardware, then network and then eth0.

P. V.
“We’re all in this together, I’m pulling for you.” Red Green

5

Thanks Guys…I found it under /etc/sysconfig/hardware/network/eth0. I’m using 11.4 KDE Desktop…I don’t know if that changed where I found it.

Thanks
Joe

6

Sorry one additional question. I have a set of bonded nic’s in the machine as well. Do I set the MTU on the Bond, the NIC’s, or Both?

Joe