[Guy Harris <gharris@xxxxxxxxx>]

ESQuicksall_Misc wrote:
> I believe the NetXtreme (Broadcom) supports jumbo frames because when I 
> configure it at the TEG side it is faster and Ethereal does not trace 
> anymore (if the NetXtreme didn't support it then I would expect Ethereal 
> to continue to trace).

I.e., if Ethereal *does* see jumbo frames, it means the card Ethereal's 
using *doesn't* support jumbo frames, but if Ethereal *doesn't* see 
jumbo frames, it means the card *does* support them?

That sounds a bit backwards to me....

You'd have to ask Broadcom whether

	1) they support jumbo frames

and

	2) if they supply jumbo frames to NDIS in the same way that they supply 
regular frames to NDIS

as WinPcap attaches to network card drivers via NDIS, and Ethereal does 
its capturing on Windows through WinPcap, so whether Ethereal sees 
packets depends on:

	whether the network adapter sees them;

	whether its driver supplies them to WinPcap via NDIS;

	whether WinPcap handles the packets supplied to it.

(I.e., this is almost certainly not an Ethereal issue, it's almost 
certainly a driver or WinPcap issue.  Ethereal has no concept of "jumbo 
frames", it just knows Ethereal frames, and doesn't particularly care if 
they're bigger than the "proper" maximum size.

Try capturing with WinDump; if it has the same symptoms as Ethereal, 
it's a driver or WinPcap issue, and I'd bet on it being a driver issue.)