[Bug 988183] Re: Logs full with "ICMPv6 RA: ndisc_router_discovery() failed to add default route"

[Mathieu Trudel-Lapierre]

In Progress/High. It's kind of annoying, if only just for the log
entries. All of the connection/disconnection states depend a lot on the
RA interval used, but that's still also quite annoying, and the fix is
clearly safe (as it's a new route with a different metric, so we don't
risk breaking stuff too much).

I'm sponsoring this to -proposed shortly, just need to apply the
debdiff, quickly test that it's properly adding the routes, and we
should be ok. It will need to be carefully tested to make sure the added
metric doesn't clash with wireless/wired coexistence: basically, we need
to make sure that on a system connected to both wired and wireless that
has ipv6 on both interfaces, the wireless default v6 route added by NM
needs to have a lower priority (higher metric) than the default ipv6
route added by NM for the wired interface. This will make sure ethernet
remains "preferred" in the event that these networks are in fact
different, and I'm a little worried that the upstream patch breaks this.

** Changed in: network-manager (Ubuntu)
       Status: New => In Progress

** Changed in: network-manager (Ubuntu)
   Importance: Undecided => High

** Changed in: network-manager (Ubuntu)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

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Title:
  Logs full with "ICMPv6 RA: ndisc_router_discovery() failed to add
  default route"

Status in “network-manager” package in Ubuntu:
  In Progress

Bug description:
  Hi,

  I am observing a lot of "ICMPv6 RA: ndisc_router_discovery() failed to add default route" in my logs.
  After a fresh reboot:

  $ dmesg | grep "ICMPv6 RA: ndisc_router_discovery() failed to add default route." | wc -l
  46

  First, I thought this is a kernel issue, but than I found a bug-report
  in the Red Hat BTS in [1].

  Just FYI: I am on Linux-3.4-rc4 - with the original Ubuntu/precise
  kernel I haven't seen this which is linux-image-3.2.0-23-generic
  (3.2.0-23.36).

  - Sedat -

  [1] https://bugzilla.redhat.com/show_bug.cgi?id=785772

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: network-manager 0.9.4.0-0ubuntu3
  Uname: Linux 3.4.0-rc4-4-generic x86_64
  ApportVersion: 2.0.1-0ubuntu5
  Architecture: amd64
  Date: Wed Apr 25 08:40:50 2012
  ExecutablePath: /usr/sbin/NetworkManager
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  IpRoute:
   default via 192.168.178.1 dev wlan0  proto static 
   169.254.0.0/16 dev wlan0  scope link  metric 1000 
   192.168.178.0/24 dev wlan0  proto kernel  scope link  src 192.168.178.22  metric 2
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH                                 
   myCastle-WLAN WPA (Wireless LAN) a74880ae-a336-4133-9454-b0376557cb6c   802-11-wireless   1335335775   Mi 25 Apr 2012 08:36:15 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                                  
   eth0       802-3-ethernet    unmanaged     /org/freedesktop/NetworkManager/Devices/1  
   wlan0      802-11-wireless   connected     /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
   running         0.9.4.0    connected       enabled       enabled         enabled    enabled         enabled

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