>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 forget to chmod the files; or when using tftp to write I forget to create a file with the correct name (and perms) first. ----- Original Message ----- From: Anton Shterenlikht [mailto:[email protected]] Sent: Thursday, July 07, 2011 05:44 PM To: [email protected] <[email protected]> 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" 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'm happy to provide more detailed information on the settings I use and a longer tcpdump output, if this helps. 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 _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[email protected]" <font size="1"> <div style='border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 1.0pt 0in'> </div> "This email is intended to be reviewed by only the intended recipient and may contain information that is privileged and/or confidential. If you are not the intended recipient, you are hereby notified that any review, use, dissemination, disclosure or copying of this email and its attachments, if any, is strictly prohibited. If you have received this email in error, please immediately notify the sender by return email and delete this email from your system." </font> _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[email protected]"
