[Soekris] Max MTU size

[Jed Clear]

On Sun, 28 Oct 2007, Jan Hoevers wrote:
> Thomas Elsgaard wrote on 28-10-2007 8:19:
> > Has anyone tried to use a MTU size above 1500 bytes on the soekris 5501
> > ? I am looking for a device that can run with a MTU size of 1544
>
> Maximum ethernet frame size is 1548 if I recall well. An IP packet with
> a size of 1500 meets that maximum.

The Via 6105M Chips on the 5501 support 802.1q VLAN tagging, which would
be an Ethernet frame size of 1522, maintaining the IP packet size of 1500.
Since there is no mention of jumbo frames, that is likely it.  However the
link to the data sheet is 404'd, so we can't rule out some wiggle room.

Not sure why you're looking for 1544, but unless every device in the path
supports it, it may be futile.  Have you tried to get PMTUD working?

-Jed