Date: Thu, 12 Aug 2004 16:09:17 +0300 From: Ruslan Ermilov <ru@freebsd.org> To: Chris Stenton <jacs@gnome.co.uk> Cc: net@freebsd.org Subject: Re: bad tcp cksum on outgoing packets Message-ID: <20040812130917.GC24142@ip.net.ua> In-Reply-To: <1092311458.13121.6.camel@hawk.gnome.co.uk> References: <1092311458.13121.6.camel@hawk.gnome.co.uk>
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--5G06lTa6Jq83wMTw Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable [Cc: freebsd-net] On Thu, Aug 12, 2004 at 12:50:58PM +0100, Chris Stenton wrote: > I have just been doing some debugging on my 5.2.1 box and noticed that > outgoing tcp packets on the box are coming up with bad checksums on > tcpdump. I am using the nge interface. >=20 > Here is a sample output. >=20 > 12:44:29.458021 0:4:e2:10:60:83 0:c:6e:4e:a0:cc ip 82: > hawk.gnome.co.uk.ssh > kite.gnome.co.uk.2167: P [bad tcp cksum 9420!] > 2071:2099(28) ack 753 win 65535 (DF) [tos 0x10] (ttl 64, id 35623, len > 68, bad cksum 0!) >=20 > 12:44:29.642088 0:c:6e:4e:a0:cc 0:4:e2:10:60:83 ip 60: > kite.gnome.co.uk.2167 > hawk.gnome.co.uk.ssh: . [tcp sum ok] 753:753(0) > ack 2099 win 64956 (DF) (ttl 128, id 44852, len 40) >=20 >=20 > Any ideas whats going on as the packet does not seem to be resent? >=20 You don't have hardware checksums enabled, do you? I barely recall they are incompatible with bpf(4). Cheers, --=20 Ruslan Ermilov ru@FreeBSD.org FreeBSD committer --5G06lTa6Jq83wMTw Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFBG2v9qRfpzJluFF4RArWxAKCYaNQSzY4GbX34pTfuYrx/sRIJ1wCfRRHJ 81zCPUKuIGlwNtRYrAdIJGI= =4GvF -----END PGP SIGNATURE----- --5G06lTa6Jq83wMTw--
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