[Bug 674701] [NEW] NTP client packets always have bad checksum

[Mike Holper]

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

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NTP client packets always have bad checksum
https://bugs.launchpad.net/bugs/674701
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