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From: Rob Landley <landley@trommello.org>
Reply-To: landley@trommello.org
Organization: Boundaries Unlimited
To: Vojtech Pavlik <vojtech@suse.cz>, Pavel Machek <pavel@suse.cz>
Subject: Re: Ethernet Error Correction
Date: Thu, 4 Oct 2001 17:34:17 -0400
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Cc: Matti Aarnio <matti.aarnio@zmailer.org>,
        Karel Kulhavy <clock@atrey.karlin.mff.cuni.cz>,
        linux-kernel@vger.kernel.org
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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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