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Date:      Sun, 8 Feb 2009 13:18:57 +0000 (GMT)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Danny Braniss <danny@cs.huji.ac.il>
Cc:        Peter Jeremy <peter@vk2pj.dyndns.org>, freebsd-stable@freebsd.org
Subject:   Re: impossible packet length ... 
Message-ID:  <alpine.BSF.2.00.0902081318000.89719@fledge.watson.org>
In-Reply-To: <E1LW9WA-0003Fu-O4@kabab.cs.huji.ac.il>
References:  <E1LW5Ht-0000VH-D8@kabab.cs.huji.ac.il> <20090208091656.GA31876@test71.vk2pj.dyndns.org> <E1LW60v-0000zC-B2@kabab.cs.huji.ac.il> <20090208104253.GB31876@test71.vk2pj.dyndns.org> <alpine.BSF.2.00.0902081252300.1129@fledge.watson.org> <E1LW9WA-0003Fu-O4@kabab.cs.huji.ac.il>

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On Sun, 8 Feb 2009, Danny Braniss wrote:

> looking at the bce source, it's not clear (to me :-). If errors are detected 
> in bce_rx_intr(), the packet gets dropped, which I would expect to be the 
> treatment of an offloded chekcum error, but it seems that is not the case.

I think we're thinking of different checksums -- devices/device drivers drop 
frames with bad ethernet checksums, but not IP and above layer checksums.

Robert N M Watson
Computer Laboratory
University of Cambridge



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