Setting MTU

Gene Heskett gene.heskett at
Mon Nov 6 13:44:12 UTC 2006

On Monday 06 November 2006 06:37, 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:
For a dsl connection, thats 1492.  Its required to strip off the additional 
8 byte header used by PPPoE.

>$ sudo ifconfig mtu 1392

You didn't give it the interface name, and I wouldn't change it that way 
anyway, I'd edit /etc/sysconfig/network-scripts/ifcfg-ethN where N is the 
eth0(1,2,etc) number and set it there.  But that advice is for an FC 
system, no idea if its valid for kubuntu as my kubunto box isn't powered 
up at the moment.  Its out in the workshop, cold.

>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.

Don't know.  ISTR the only place I have a 1492 setting is in the routers (a 
linksys BEFSR41 here) advanced->filters setup page. Once it gets this side 
of my router, everything is back to 1500 and I'm having no problems 
because of that.

>Dotan Cohen

Cheers, Gene
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Copyright 2006 by Maurice Eugene Heskett, all rights reserved.

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