Setting MTU

Johan Ramm-Ericson ubuntu at
Mon Nov 6 12:45:18 UTC 2006

On Mon, November 6, 2006 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
> $
> Also, I connect via a Level1 router. Must I change the mtu in the
> router as well? Thanks in advance.
> Dotan Cohen

1) sudo ifconfig eth0 mtu 1392
2) I would change it on the router (only), but why is your ISP saying you
should change the MTU?


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