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[LaMont Jones <lamont.jones@xxxxxxxxxxxxx>]

I believe that this happens because the config
(/proc/sys/net/ipv6/conf/all/accept_ra_defrtr) says to accept a default
route, and you have one specified in /etc/network/interfaces, and
therefore the advertised default route fails to get added to the routing
table.

It would be a good thing if the logged error (1) said what it was trying
to add as the default route, and (2) was rate limited, and (3) pointed
at accept_ra_defrtr

Having ifup turn off accept_ra_defrtr when it adds a default route might
be a good thing, too.

Just my thoughts.

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https://bugs.launchpad.net/bugs/1065974

Title:
  dmesg full of "ICMPv6 RA: ndisc_router_discovery() failed to add
  default route"

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I am using Ubuntu Server 12.04.1 LTS and since IPv6 RAs are enabled on
  wired connection, the message "ICMPv6 RA: ndisc_router_discovery()
  failed to add default route" fills dmesg.

  The default route is being set nontheless:

  2001:638:a000:4104::/64 dev eth0  proto kernel  metric 256 
  fe80::/64 dev eth0  proto kernel  metric 256 
  default via fe80::1 dev eth0  metric 1024 

  /etc/network/interfaces looks like this:

  # The primary network interface
  auto eth0
  iface eth0 inet static
          address 131.188.31.189
          netmask 255.255.255.0
          gateway 131.188.31.1
          dns-nameservers 131.188.0.11 131.188.0.10
          dns-domain informatik.uni-erlangen.de
          dns-search informatik.uni-erlangen.de
  iface eth0 inet6 static
          address 2001:638:a000:4104::189
          netmask 64
          gateway fe80::1
          dns-nameservers 2001:638:a000:1053:53::1 2001:638:a000:1053:53::2

  NetworkManager is not installed, so I don't think its a dublicate of
  #988183

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-31-virtual 3.2.0-31.50
  ProcVersionSignature: Ubuntu 3.2.0-31.50-virtual 3.2.28
  Uname: Linux 3.2.0-31-virtual x86_64
  AlsaDevices:
   total 0
   crw-rw---T 1 root audio 116,  1 Okt  4 23:10 seq
   crw-rw---T 1 root audio 116, 33 Okt  4 23:10 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu13
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Date: Fri Oct 12 15:12:44 2012
  HibernationDevice: RESUME=UUID=f3f34eb5-dc4d-47b9-b67e-6938afa8a07a
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
  MachineType: Bochs Bochs
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm-256color
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-virtual root=UUID=07c76f05-3330-4c30-b1f5-488a08024a0d ro
  ProcModules:
   floppy 70365 0 - Live 0x0000000000000000
   lp 17799 0 - Live 0x0000000000000000
   parport 46562 1 lp, Live 0x0000000000000000
   psmouse 97362 0 - Live 0x0000000000000000
   serio_raw 13211 0 - Live 0x0000000000000000
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-31-virtual N/A
   linux-backports-modules-3.2.0-31-virtual  N/A
   linux-firmware                            1.79.1
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/01/2007
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs

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