Public bug reported:
Binary package hint: ntp
UDP packets from my Ubuntu 10.10 NTP client (.143.2) to my NTP server (.143.13)
appear to always have a bad checksum, as reflected here in this tcpdump
capture: (started as "sudo tcpdump -nvv udp port 123")
-----------------------------
11:12:46.871451 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 76)
192.168.143.2.123 > 192.168.143.13.123: [bad udp cksum 1cf6!] NTPv4, length
48
Client, Leap indicator: (0), Stratum 4 (secondary reference), poll
10s, precision -20
Root Delay: 0.367874, Root dispersion: 0.486328, Reference-ID:
192.168.143.13
Reference Timestamp: 3498584143.872812747 (2010/11/12 10:55:43)
Originator Timestamp: 3498584143.811634063 (2010/11/12 10:55:43)
Receive Timestamp: 3498584143.872812747 (2010/11/12 10:55:43)
Transmit Timestamp: 3498585166.871437788 (2010/11/12 11:12:46)
Originator - Receive Timestamp: +0.061178639
Originator - Transmit Timestamp: +1023.059803709
11:12:46.873147 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 76)
192.168.143.13.123 > 192.168.143.2.123: [udp sum ok] NTPv4, length 48
Server, Leap indicator: (0), Stratum 3 (secondary reference), poll
10s, precision -14
Root Delay: 0.367065, Root dispersion: 0.405197, Reference-ID:
149.20.54.20
Reference Timestamp: 3498580747.587430417 (2010/11/12 09:59:07)
Originator Timestamp: 3498585166.871437788 (2010/11/12 11:12:46)
Receive Timestamp: 3498585166.812102258 (2010/11/12 11:12:46)
Transmit Timestamp: 3498585166.812599122 (2010/11/12 11:12:46)
Originator - Receive Timestamp: -0.059335514
Originator - Transmit Timestamp: -0.058838650
-----------------------------
This is my first bug report, so hopefully I've included everything that is
needed. If not, please let me know what else is needed and I'll do my best to
get it.
Thanks!
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: ntp 1:4.2.4p8+dfsg-1ubuntu6
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Fri Nov 12 11:11:46 2010
EcryptfsInUse: Yes
ExecutablePath: /usr/sbin/ntpd
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
NtpStatus:
remote refid st t when poll reach delay offset jitter
==============================================================================
*nematode.local 149.20.54.20 3 u 964 1024 377 0.816 -60.770 5.488
ProcAttrCurrent: /usr/sbin/ntpd (enforce)
ProcEnviron:
SourcePackage: ntp
mtime.conffile..etc.ntp.conf: 2010-11-10T10:30:46.779535
** Affects: ntp (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug maverick
--
NTP client packets always have bad checksum
https://bugs.launchpad.net/bugs/674701
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