[Impact]
Minor impact, this should only be affecting users of the kernel mainline packages since we're not shipping kernel 3.3.0 where the issue is presumed to occur, take care of letting these users also benefit from stable connections since they may need these kernels for new hardware support (and kernels that may be backported in the future). This only affects IPv6-enabled network where the kernel expects to setup a default route by itself and doesn't play nice with something else modifying the routes.
[Development Fix]
Fixed upstream, as http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=77de91e5a8b1c1993ae65c54b37e0411e78e6fe6. See https://bugzilla.gnome.org/show_bug.cgi?id=673476 (upstream bug). This change only affects NetworkManager's code, doesn't require rebuild of any dependant package.
[Stable Fix]
See above "Development fix".
[Test Case]
1) Connect to an IPv6 network with a kernel 3.3.0 or higher.
2) Observe behavior in 'ip route -6' and messages in /var/log/syslog. Wireless connections should remain stable.
[Regression Potential]
Only IPv6 could be affected, no potential for regression expected for IPv4 routing or other parts of NetworkManager. Routing may be incorrect, resulting in the wrong device taking precedence for data being sent over the network when IPv6 is in use; IPv6 connections (or connections altogether, if IPv6 is set to "Required" (which is not by default)) may be torn down or unavailable due to invalid routes.
---------
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
Created attachment 572767
/var/log/messages
It seems that, with the latest kernel, my network connection (Ethernet 100BaseT) is unstable:
The connection is "disconnected" every 10 minutes interval according to NetworkManager (with a notification on screen).
I'm using
kernel-
NetworkMana
My network interface is a
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
My computer is connected to a FreeBox v5 ADSL router, which provides "native" IPv6 broadband access.