Date: Fri, 8 Jul 2011 12:00:05 +0100 From: Anton Shterenlikht <mexas@bristol.ac.uk> To: "C. P. Ghost" <cpghost@cordula.ws> Cc: freebsd-questions@freebsd.org Subject: Re: tftp - bad checksum error? can't transfer file Message-ID: <20110708110005.GD34870@mech-cluster241.men.bris.ac.uk> In-Reply-To: <CADGWnjXwK=OrKCtYPSi=ziGZ5ZKEeSsPb=_MrtbSmQTBro9nyw@mail.gmail.com> References: <20110707224435.GA27624@mech-cluster241.men.bris.ac.uk> <CADGWnjXwK=OrKCtYPSi=ziGZ5ZKEeSsPb=_MrtbSmQTBro9nyw@mail.gmail.com>
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On Fri, Jul 08, 2011 at 12:05:37PM +0200, C. P. Ghost wrote: > On Fri, Jul 8, 2011 at 12:44 AM, Anton Shterenlikht <mexas@bristol.ac.uk> wrote: > > I'm trying to troubleshoot tftpd(8). > > (...) > > > ? ?192.168.232.10.15388 > buzi.tftp: [no cksum] ?25 RRQ "/bsd.rd.IP32" 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)!) > > ? ?buzi.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], proto 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. I just have a direct ethernet connection between my FreeBSD laptop with bootpd/tftpd servers (one ethernet port only) and a node which I want to boot (also a single ethernet port). Is there way for me to check whether either of these ports are "dying"? Any further diagnostics I can do? Many thanks Anton -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 331 5944 Fax: +44 (0)117 929 4423
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