From owner-freebsd-hackers@FreeBSD.ORG  Thu Jan 11 12:00:20 2007
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Date: Thu, 11 Jan 2007 13:00:18 +0100
From: "Pietro Cerutti" <pietro.cerutti@gmail.com>
To: "FreeBSD Questions" <freebsd-questions@freebsd.org>, 
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Cc: 
Subject: Fwd: [SOLVED] re(4) incorrect checksum
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On 1/11/07, Bernd Walter <ticso@cicely12.cicely.de> wrote:
> On Thu, Jan 11, 2007 at 11:51:51AM +0100, Pietro Cerutti wrote:
> > Hi lists,
> > ifconfig re0 -txcsum -rxcsum solved the problem....
> >
> > Anyway, is this a bug in the driver or in the interface itself?
>
> That is how checksum offloading works.
> tcpdump can't see a correct checksum, because it is not calculated
> by the kernel and left for the hardware.

Yes, I got it.

> However checksum offloading is broken for re(4) based cards, therefor
> it is disabled by default.

I don't think so.... at least, I did nothing to enable it, but it were
indeed enabled (RXCSUM,TXCSU showed up in the options field shown by
ifconfig)

>
> --
> B.Walter                http://www.bwct.de      http://www.fizon.de
> bernd@bwct.de           info@bwct.de            support@fizon.de
>


--
Pietro Cerutti
ICQ: 117293691
PGP: 0x9571F78E

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