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[Sander Jonkers <1120617@xxxxxxxxxxxxxxxxxx>]

In a new setup (Sitecom router, no more Zyxel) and Ubuntu 13.10, I still
have the same problem via Wifi:

[ 1782.075212] IPv6: wlan0: IPv6 duplicate address 2001:abc:1234:b45d:1af4:6aff:fe9c:ced4 detected!
[ 1813.616483] IPv6: wlan0: IPv6 duplicate address 2001:abc:1234:b45d:1af4:6aff:fe9c:ced4 detected!
[ 1868.605625] IPv6: wlan0: IPv6 duplicate address 2001:abc:1234:b45d:1af4:6aff:fe9c:ced4 detected!
[ 1899.938703] IPv6: wlan0: IPv6 duplicate address 2001:abc:1234:b45d:1af4:6aff:fe9c:ced4 detected!
[ 1955.019861] IPv6: wlan0: IPv6 duplicate address 2001:abc:1234:b45d:1af4:6aff:fe9c:ced4 detected!
[ 2011.786209] IPv6: wlan0: IPv6 duplicate address 2001:abc:1234:b45d:1af4:6aff:fe9c:ced4 detected!
[ 2069.830439] IPv6: wlan0: IPv6 duplicate address 2001:abc:1234:b45d:1af4:6aff:fe9c:ced4 detected!

and my wlan0 gets no public IPv6 address.

Problem goes away with "sudo sysctl net.ipv6.conf.wlan0.accept_dad=0"

Some analysis would be nice.

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https://bugs.launchpad.net/bugs/1120617

Title:
  No IPv6 and "IPv6 duplicate address" with IPv6 privacy extensions on

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Short:

  I get no public IPv6 address and  "IPv6 duplicate address" in dmesg with IPv6 privacy extensions on.
  Disabling DAD does not solve it.
  Disabling privacy extension with "net.ipv6.conf.all.use_tempaddr=-1" in /etc/sysctl.conf, works as a workaround: I get the public IPv6 address based on my MAC address.

  This is a bug; privacy extensions should not disable IPv6.

  FWIW: on the same LAN, both Windows 7 and Android 4.x do get a public
  IPv6. For Windows 7, I'm sure it's IPv6 address with privacy
  extension.

  Long:

  Since some time I did not get a public IPv6 address anymore (provided
  natively by my ISP). Some lines from dmesg:

  [51849.455380] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:1af4:6aff:fe9c:ced4 detected!
  [52038.685221] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:1af4:6aff:fe9c:ced4 detected!
  [52208.691846] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:1af4:6aff:fe9c:ced4 detected!
  [52393.831468] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:1af4:6aff:fe9c:ced4 detected!
  [52546.966404] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:1af4:6aff:fe9c:ced4 detected!
  [52713.804952] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:1af4:6aff:fe9c:ced4 detected!

  I tried to disabled duplicate detection like below, but that didn't
  work:

  sander@R540:~$ sudo sysctl net.ipv6.conf.eth0.accept_dad
  net.ipv6.conf.eth0.accept_dad = 1

  sander@R540:~$ sudo sysctl net.ipv6.conf.eth0.accept_dad=0
  net.ipv6.conf.eth0.accept_dad = 0

  I got this in dmesg:

  [58037.095963] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:1af4:6aff:fe9c:ced4 detected!
  [58037.519619] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:cdb:467c:e1e6:7532 detected!
  [58038.424991] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:58eb:c65e:25e:b3c7 detected!
  [58039.141499] IPv6: wlan0: IPv6 duplicate address 2a00:cd8:blabla:a413:1a:2614:e16a detected!
  [58039.141507] IPv6: ipv6_create_tempaddr: regeneration time exceeded - disabled temporary address support

  It seemed that after a fresh boot, there was a public IPv6 for a few
  seconds, which then disappeared.

  "rdisc6 wlan0" shows a correct function advertisement.

  Somewhere in the trial-and-error process, I also got:

  [14790.090074] ICMPv6: NA: someone advertises our address 2a00:0cd8:blabla:1182:7070:8ebf:4fe1 on wlan0!
  [14790.090228] ICMPv6: NA: someone advertises our address 2a00:0cd8:blabla:1af4:6aff:fe9c:ced4 on wlan0!

  I finally fell back to this workaround:
  Disabling privacy extension with "net.ipv6.conf.all.use_tempaddr=-1" in /etc/sysctl.conf, works as a workaround: I get the public IPv6 address based on my MAC address.

  See more info here: http://ubuntuforums.org/showthread.php?p=12501110

  FWIW: My modem is a Zyxel P-2812HNU-F1 with firmware V3.11(TUE.5)-2_20121211. I don't think this bug is related to the modem, as:
  - rdisc6 works
  - MAC based IPv6 works
  - other devices work

  As I'm now forced to use my MAC based IPv6 address, which means less
  privacy and thus less security, I'll mark this also as a security
  related bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-21-generic 3.5.0-21.32
  ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
  Uname: Linux 3.5.0-21-generic x86_64
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sander     2644 F.... pulseaudio
  CRDA:
   country NL:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20), NO-OUTDOOR
   	(5250 - 5330 @ 40), (N/A, 20), NO-OUTDOOR, DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Date: Sat Feb  9 22:08:08 2013
  HibernationDevice: RESUME=UUID=56ea62f2-0b4c-4dc9-9f41-b3423fccfa31
  InstallationDate: Installed on 2012-06-27 (227 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. R530/R730/R540
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-21-generic root=UUID=97828b35-0e7b-4cf2-9854-ae33c942d4bd ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-21-generic N/A
   linux-backports-modules-3.5.0-21-generic  N/A
   linux-firmware                            1.95
  SourcePackage: linux
  UpgradeStatus: Upgraded to quantal on 2012-10-19 (113 days ago)
  dmi.bios.date: 06/21/2010
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 08JV.M029.20100621.hkk
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: R530/R730/R540
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr08JV.M029.20100621.hkk:bd06/21/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnR530/R730/R540:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR530/R730/R540:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: R530/R730/R540
  dmi.product.version: Not Applicable
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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