Setting MTU

Perfect Stranger stranger1121 at
Mon Nov 6 13:42:43 UTC 2006

2006/11/6, Dotan Cohen <dotancohen at>:
> 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

If you want to change mtu in for example eth0, you must write
# ifconfig eth0 mtu 1392

But I think, that right is 1492 :-)

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