[ECOS] rattler PB

Slawek sgp@telsatgp.com.pl
Thu Dec 18 10:25:00 GMT 2003

Andrew Lunn wrote:

> On Thu, Dec 18, 2003 at 09:22:47AM +0100, alix t wrote:
> > We try to develop applications with goahead web server
> > and other network services on rattler card , but our
> > applications often crash.
> > So we want first validate ethernet and IP stacks.
> > I think to send very large packets is a good test to
> > validate ethernet stack.
> Its not a realistic test. I doubt any application will use such large
> IP packets. UDP has a maximum packet size of around 4Kbytes. TCP will
> generally use either around 800 bytes or around 1500 bytes depending
> on if MTU discovery is being used. 
> Only a custom application which is not using UDP or TCP can generate
> such big IP packets. Typically this would be for connecting super
> computers together using HIPI interfaces. Thats why IPv6 has a jumbo
> packet which can be bigger than 64Kbytes. 
> I suggest you try more realistic tests.

Keep in mind that he has tried to send big packets *to* the device,
*not* write a special program for the device which failed when
sending those.

If such packets causes the device to crash, then the *final* product
could be *crashed* as well, by accident or intentionally.


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