Date: Thu, 11 Jan 2007 14:34:47 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Rene Ladan <r.c.ladan@gmail.com> Cc: pyunyh@gmail.com, freebsd-hackers@freebsd.org, Pietro Cerutti <pietro.cerutti@gmail.com> Subject: Re: re(4) incorrect checksum Message-ID: <20070111193447.GA35711@xor.obsecurity.org> In-Reply-To: <45A659A1.2060401@gmail.com> References: <e572718c0701110229q60a66d32o68f789c889b4a06@mail.gmail.com> <45A61C1A.3090600@gmail.com> <20070111122049.GE33964@cdnetworks.co.kr> <45A659A1.2060401@gmail.com>
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--OgqxwSJOaUobr8KG Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jan 11, 2007 at 04:37:05PM +0100, Rene Ladan wrote: > Pyun YongHyeon schreef: > > On Thu, Jan 11, 2007 at 12:14:34PM +0100, Rene Ladan wrote: > > > Pietro Cerutti schreef: > > > > Hi lists, > > > >=20 > > > > FreeBSD gahrtop.localhost 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #1: > > > > Tue Jan 9 19:34:13 CET 2007 > > > > root@gahrtop:/usr/obj/usr/src/sys/GAHRTOP i386 > > > >=20 > > > > CPU: Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz (2000.15-MHz > > > > 686-class CPU) > > > > Cores per package: 2 > > > >=20 > > > > re0: <RealTek 8168B/8111B PCIe Gigabit Ethernet> port 0xc800-0xc8ff > > > > mem 0xff2ff000-0xff2fffff irq 17 at device 0.0 on pci2 > > > >=20 > > > > ($FreeBSD: src/sys/dev/re/if_re.c,v 1.46.2.20 2006/09/21 11:08:28 > > > > yongari Exp $) > > > >=20 > > > > I get checksum errors on every packet I send, example: > > > >=20 > > > > Checksum: 0x0bc5 [incorrect, should be 0x78fe (maybe caused by > > > > checksum offloading?)] > > > >=20 > > > > I think this could be the cause of some web pages (e.g. Gmail in > > > > standard view [html view works well]) not to be displayed. > > > >=20 > > > > I tracked down the problem to the re(4) driver just because wlan w= orks > > > > good... > > > >=20 > > > > Any ideas? > > > >=20 > > > I'm also seeing these www problems with my re(4) card (chipid > > > 0x816810ec), see > > > http://lists.freebsd.org/pipermail/freebsd-current/2006-December/068= 333.html > > >=20 > >=20 > > Does your re(4) also work when you disable checksum offload? > >=20 > Yes, 'ifconfig re0 -txcsum' does the trick. >=20 > re0: <RealTek 8168/8111B PCIe Gigabit Ethernet> port 0xc800-0xc8ff mem > 0xfe0ff000-0xfe0fffff irq 16 at device 0.0 on pci2 >=20 > if.re.c revision 1.80 2006/12/20 02:13:59 marius Can you confirm that you see checksum errors when viewing the packet from another host on the subnet? It's of course to be expected that a sending host with checksum offload on the NIC will not see the correct checksum before offloading the packet to the NIC, and this in itself does not indicate a problem. Kris --OgqxwSJOaUobr8KG Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.1 (FreeBSD) iD8DBQFFppFXWry0BWjoQKURAse2AJ40VBido0+37ilYXohYfbMj8t3DmQCeOCiH vxBjGZYIb5imJevNE5GrNS0= =ja4f -----END PGP SIGNATURE----- --OgqxwSJOaUobr8KG--
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