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Re: Turning off CRC check in NIC

To: Carl-Johan Bostorp <ctor@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: Turning off CRC check in NIC
From: Donald Becker <becker@xxxxxxxxx>
Date: Sat, 10 Nov 2001 18:31:37 -0500 (EST)
Cc: netdev@xxxxxxxxxxx
In-reply-to: <20011110134559.A19083@ratula.moonlight.se>
Sender: owner-netdev@xxxxxxxxxxx
On Sat, 10 Nov 2001, Carl-Johan Bostorp wrote:

> I want to turn off the CRC check on ethernet frames and pass every
> packet up to the kernel.

Why?

> I have an eepro100, so I mailed Intel about
> it and asked for specs. The reply I got was that the kernel may
> actually rely on the NIC doing this check. 
> 
> So, what's the deal? What effects will there be if the NIC starts
> passing everything up to the kernel? 

The network stack will interpret arbitrarily corrupted packets as valid
data.  Very Bad Things might happen, and you'll not know what occurred or
why.


Donald Becker                           becker@xxxxxxxxx
Scyld Computing Corporation             http://www.scyld.com
410 Severn Ave. Suite 210               Second Generation Beowulf Clusters
Annapolis MD 21403                      410-990-9993


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