Setting MTU

David Hart ubuntu at
Mon Nov 6 12:09:52 UTC 2006

On Mon, Nov 06, 2006 at 01:37:07PM +0200, Dotan Cohen wrote:
> When I check ifconfig, I see that my mtu is 1500. However, my ISP said
> that I should change it to 1392. So:
> $ sudo ifconfig mtu 1392
> SIOCSIFADDR: No such device
> mtu: ERROR while getting interface flags: No such device
> $

You should specify the interface, for example:

  sudo ifconfig eth0 mtu 1392
> Also, I connect via a Level1 router. Must I change the mtu in the
> router as well? Thanks in advance.

You only need set it on your pc.

David Hart <ubuntu at>

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