Date: Thu, 7 Jul 2011 17:54:38 -0500 From: Gary Gatten <Ggatten@waddell.com> To: "'mexas@bristol.ac.uk'" <mexas@bristol.ac.uk>, "'freebsd-questions@freebsd.org'" <freebsd-questions@freebsd.org> Subject: Re: tftp - bad checksum error? can't transfer file Message-ID: <9104_1310079280_4E163930_9104_2159_1_D9B37353831173459FDAA836D3B43499C2309D2D@WADPMBXV0.waddell.com> In-Reply-To: <20110707224435.GA27624@mech-cluster241.men.bris.ac.uk>
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>From my experience tcpdump is misleading re udp fragments and chksums. If =
the packet gets fragmented, udp will report bad chksums at some point.
Check your file names (case), perms, etc. 90% of time I typo a name or for=
get to chmod the files; or when using tftp to write I forget to create a fi=
le with the correct name (and perms) first.
----- Original Message -----
From: Anton Shterenlikht [mailto:mexas@bristol.ac.uk]
Sent: Thursday, July 07, 2011 05:44 PM
To: freebsd-questions@freebsd.org <freebsd-questions@freebsd.org>
Subject: tftp - bad checksum error? can't transfer file
I'm trying to troubleshoot tftpd(8).
% grep boot /etc/inetd.conf
tftp dgram udp wait root /usr/libexec/tftpd tftpd -dd -l -s /tftpboot
tftp dgram udp wait root /usr/libexec/tftpd tftpd -dd -l -s /tftpboot
bootps dgram udp wait root /usr/libexec/bootpd bootpd -d4 -t0 /etc/bootptab
%
I'm trying to boot another node via bootp/tftp.
I'm monitoring what's going on with tcpdump -vv.
bootpd starts fine, and seems to read /etc/bootptab
correctly.
But after that nothing happens, and after a few minutes
I get on the console of the host which I want to boot:
> bootp()/bsd.rd.IP32
Unable to execute bootp()/bsd.rd.IP32: invalid argument
>
Does this tcpdump fragment help to understand where
the problem is:
192.168.232.10.15388 > buzi.tftp: [no cksum] 25 RRQ "/bsd.rd.IP32" oct=
et (
o
23:25:21.024160 IP (tos 0x0, ttl 64, id 56, offset 0, flags [none], proto U=
DP (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'm happy to provide more detailed information
on the settings I use and a longer tcpdump output,
if this helps.
Many thanks
Anton
--=20
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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