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List:       linux-kernel
Subject:    Re: Ethernet Error Correction
From:       Rob Landley <landley () trommello ! org>
Date:       2001-10-04 21:34:17
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On Tuesday 02 October 2001 05:55, Vojtech Pavlik wrote:
> On Tue, Oct 02, 2001 at 11:48:01AM +0200, Pavel Machek wrote:
>
> Well, if you checked all the cables, you'd most likely find the device
> capable of sending the bad CRC frames. Also, if you use a switch (not ha
> hub or coax), it won't work at all.

You can cause a lot of switches to degrate to HUB mode by overloading their 
arp cache mac address table thingy.  (Fun for packet sniffing when you've got 
a card that can change its mac address in software.  Send packets originating 
from a few thousand different mac IDs and watch the switch throw up its hands 
and go "AAAAAH!".  Sniffing the right init sequence for a pppoe connection 
with nonstandard authentication can be a bit difficult otherwise, with modern 
hardware... :)

I haven't tried it on a very wide variety of manufacturer's switches, though. 
 And I dunno how that relates to CRC behavior...

Rob
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