IPv6 Global address fails to come up due to DAD failure

[pierz]

My main interface eth0 fails to bring up its IPv6 global address - despite having done so on Ubuntu 9.04. We have been running IPv6 for a few years without problem here. The interface has a link local address and sends out an RA to do DAD but the kernel (wrongly) seems to assume there has been a duplicate address detected and does not assign the address to the interface. This can been seen by looking in the /var/log/messages where there are copious messages:
Nov 13 15:10:47 ballard kernel: [ 1251.856114] eth0: IPv6 duplicate address detected!

My current workaround to disbale DAD by doing the following:
root# echo '0' > /proc/sys/net/ipv6/conf/eth0/accept_dad

ProblemType: Bug
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: AMD8111 [AMD AMD8111], device 0: Intel ICH [AMD AMD8111]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: piers 2848 F.... pulseaudio
 /dev/snd/controlC1: piers 2848 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'AMD8111'/'AMD AMD8111 with ALC655 at irq 17'
   Mixer name : 'Realtek ALC655 rev 0'
   Components : 'AC97a:414c4760'
   Controls : 41
   Simple ctrls : 26
Card1.Amixer.info:
 Card hw:1 'U0x46d0x8ca'/'USB Device 0x46d:0x8ca at usb-0000:01:03.2-3.3, high speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:08ca'
   Controls : 2
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined
   Capture channels: Mono
   Limits: Capture 0 - 3072
   Mono: Capture 0 [0%] [18.00dB] [on]
Date: Fri Nov 13 15:23:15 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=d74a1f12-7645-4e7f-af80-a686e39da483
MachineType: Sun Microsystems W1100z/2100z
NonfreeKernelModules: nvidia
Package: linux-image-2.6.31-15-generic 2.6.31-15.50
ProcCmdLine: root=UUID=8d4be6f5-8040-4dd5-b4bc-58676a6c0af7 ro splash vga=795
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-15-generic N/A
 linux-firmware 1.25
RfKill:

SourcePackage: linux
Uname: Linux 2.6.31-15-generic i686
WpaSupplicantLog:

dmi.bios.date: 09/29/2006
dmi.bios.vendor: Sun Microsystems
dmi.bios.version: R01-B5 S1
dmi.board.name: K85AE
dmi.board.vendor: Sun Microsystems
dmi.board.version: 501-6851
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 7
dmi.chassis.vendor: Sun Microsystems
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnSunMicrosystems:bvrR01-B5S1:bd09/29/2006:svnSunMicrosystems:pnW1100z/2100z:pvr602-2836-02:rvnSunMicrosystems:rnK85AE:rvr501-6851:cvnSunMicrosystems:ct7:cvrN/A:
dmi.product.name: W1100z/2100z
dmi.product.version: 602-2836-02
dmi.sys.vendor: Sun Microsystems

[Jeremy Foshee (jeremyfoshee)]

Hi pierz,

This bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? Can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux 482181

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

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[Jeremy Foshee (jeremyfoshee)]

This bug report was marked as Incomplete and has not had any updated comments for quite some time. As a result this bug is being closed. Please reopen if this is still an issue in the current Ubuntu release http://www.ubuntu.com/getubuntu/download . Also, please be sure to provide any requested information that may have been missing. To reopen the bug, click on the current status under the Status column and change the status back to "New". Thanks.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]