Setting MTU

Dotan Cohen dotancohen at
Mon Nov 6 12:48:12 UTC 2006

On 06/11/06, Steve Flynn <anothermindbomb at> wrote:
> On 06/11/06, Dotan Cohen <dotancohen at> wrote:
> >
> > I'm on a cable connection. Tell me, how can I check the mtu of the
> > router? I went through all the config options, and didn't see anything
> > related to MTU. Is there a way to check externally, like a ping
> > command that asks it "By the way, what's your mtu?"
> >
> Unfortunately, this information is firmware specific. You router may not
> permit you to change, or even view this information. Alternatively, it could
> be like my ADSL router which openly displays it and permit you to change it
> via a web interface. Whether you can modify it is purely down to the
> manufacturer.
> Personally, I'd be astounded if the MTU of your router isn't 1500 so if your
> setting the MTU on your network card to 1392 you'll have no issues. A very
> slight drop in throughput, but practically unnoticable.
>  I would ask your ISP why they have their kit running on 1400 MTU and thus
> you having to mess around with your settings though. Seems a little odd in
> this day and age.

If you find this unusual, then I will ask them. Want to tell me what
it should be set to, and the disadvantages and advantages of each
setting? I want to be well armed when I ask them, not just some
ignorant Parrot repeating what I've been told. Educate me a bit.


Dotan Cohen

More information about the ubuntu-users mailing list