From owner-freebsd-questions@FreeBSD.ORG  Fri Jul  8 10:05:39 2011
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 350D3106566C
	for <freebsd-questions@freebsd.org>;
	Fri,  8 Jul 2011 10:05:39 +0000 (UTC)
	(envelope-from cpghost@cordula.ws)
Received: from mail-vx0-f182.google.com (mail-vx0-f182.google.com
	[209.85.220.182])
	by mx1.freebsd.org (Postfix) with ESMTP id EEFFE8FC1E
	for <freebsd-questions@freebsd.org>;
	Fri,  8 Jul 2011 10:05:38 +0000 (UTC)
Received: by vxg33 with SMTP id 33so1735715vxg.13
	for <freebsd-questions@freebsd.org>;
	Fri, 08 Jul 2011 03:05:38 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.52.24.74 with SMTP id s10mr2505496vdf.111.1310119537395; Fri,
	08 Jul 2011 03:05:37 -0700 (PDT)
Received: by 10.220.7.146 with HTTP; Fri, 8 Jul 2011 03:05:37 -0700 (PDT)
X-Originating-IP: [93.221.178.105]
In-Reply-To: <20110707224435.GA27624@mech-cluster241.men.bris.ac.uk>
References: <20110707224435.GA27624@mech-cluster241.men.bris.ac.uk>
Date: Fri, 8 Jul 2011 12:05:37 +0200
Message-ID: <CADGWnjXwK=OrKCtYPSi=ziGZ5ZKEeSsPb=_MrtbSmQTBro9nyw@mail.gmail.com>
From: "C. P. Ghost" <cpghost@cordula.ws>
To: freebsd-questions@freebsd.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Subject: Re: tftp - bad checksum error? can't transfer file
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 08 Jul 2011 10:05:39 -0000

On Fri, Jul 8, 2011 at 12:44 AM, Anton Shterenlikht <mexas@bristol.ac.uk> w=
rote:
> I'm trying to troubleshoot tftpd(8).

(...)

> =A0 =A0192.168.232.10.15388 > buzi.tftp: [no cksum] =A025 RRQ "/bsd.rd.IP=
32" octet (
> o
> 23:25:21.024160 IP (tos 0x0, ttl 64, id 56, offset 0, flags [none], proto=
 UDP (1
> 7), length 30, bad cksum 0 (->293a)!)
> =A0 =A0buzi.19330 > 192.168.232.10.15388: [udp sum ok] UDP, length 2
> 23:25:51.013759 IP (tos 0x0, ttl 255, id 256, offset 0, flags [none], pro=
to UDP
> (17), length 53)

I've had some trouble netbooting / jumpstaring recently with a similar
pattern (using RARP/BOOTP/TFTP/NFS). It turned out to be a dying
port on the switch whose errors were masked by TCP in day to day
use, but alas were too frequent for UDP.

-cpghost.

--=20
Cordula's Web. http://www.cordula.ws/