Date: Fri, 9 Apr 2004 18:41:50 +0300 From: Ruslan Ermilov <ru@freebsd.org> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-stable@freebsd.org Subject: Re: bad tcp/udp checksumsc with 5704C Message-ID: <20040409154150.GD1992@ip.net.ua> In-Reply-To: <20040407170932.GA74440@xor.obsecurity.org> References: <Pine.LNX.4.33.0404071450090.22128-100000@ux1.ibb.net> <20040407170932.GA74440@xor.obsecurity.org>
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--8w3uRX/HFJGApMzv Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Apr 07, 2004 at 10:09:33AM -0700, Kris Kennaway wrote: [...] > I ran into this yesterday with a different NIC, and Peter Wemm told me > that tcpdump indeed gets it wrong for locally-generated packets when > the card does checksum offloading. Indeed, when I ran the tcpdump on > another machine on the LAN it verified that the checksums on those > packets were all correct. >=20 This is even more odd when the card does VLAN stripping/tagging in hardware. RELENG_4 gets it slightly less wrong though. Cheers, --=20 Ruslan Ermilov ru@FreeBSD.org FreeBSD committer --8w3uRX/HFJGApMzv Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAdsQ+Ukv4P6juNwoRAgSnAJ0TYWj7rdx+NecQidnhls10Q3QgnACfalPp k/R/D94rEU6OYL6Za8PcI8A= =KFV8 -----END PGP SIGNATURE----- --8w3uRX/HFJGApMzv--
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