Network reconnects every 10 minutes

[Vernon Tang]

After upgrading to Precise, precisely every 10 minutes the network goes down and reconnects. The machine is connected via Ethernet and gets an address with DHCP. I've verified that the Ethernet link isn't actually going down when this happens and that the DHCP lease isn't expiring.

There's a whole cascade of syslog messages that appear when this happens, starting with:
> Apr 16 10:24:41 hot-27 NetworkManager[1041]: <info> (eth0): device state change: activated -> failed (reason 'ip-config-unavailable') [100 120 5]
> Apr 16 10:24:42 hot-27 NetworkManager[1041]: <warn> Activation (eth0) failed.
> Apr 16 10:24:42 hot-27 NetworkManager[1041]: <info> (eth0): device state change: failed -> disconnected (reason 'none') [120 30 0]
> Apr 16 10:24:42 hot-27 NetworkManager[1041]: <info> (eth0): deactivating device (reason 'none') [0]

The messages above are often preceded by a message like this (the machine is in a native IPv6 environment), although it doesn't happen exactly every 10 minutes like the NM disconnect:
> Apr 16 10:22:06 hot-27 kernel: [ 1102.631666] ICMPv6 RA: ndisc_router_discovery() failed to add default route.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.4.0-0ubuntu3
Uname: Linux 3.4.0-030400rc2-generic-pae i686
ApportVersion: 2.0.1-0ubuntu3
Architecture: i386
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Mon Apr 16 10:19:26 2012
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
IpRoute:
 default via 10.13.0.1 dev eth0 proto static
 10.13.0.0/23 dev eth0 proto kernel scope link src 10.13.1.139 metric 1
 169.254.0.0/16 dev eth0 scope link metric 1000
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
RfKill:

SourcePackage: network-manager
UpgradeStatus: Upgraded to precise on 2012-04-12 (3 days ago)
nmcli-con:
 NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH
 Wired connection 1 2e154def-987a-4886-b095-299000d2b3db 802-3-ethernet 1334535549 Mon 16 Apr 2012 10:19:09 EST yes no /org/freedesktop/NetworkManager/Settings/1
 Wired connection 2 e7a80f3c-fe35-47c5-bed0-fc58f610dd94 802-3-ethernet 1323408191 Fri 09 Dec 2011 16:23:11 EST yes no /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 eth0 802-3-ethernet 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 disabled

[Mathieu Trudel-Lapierre (cyphermox)]

Nice catch. Would you mind also providing debugging logs for NetworkManager?

See http://wiki.ubuntu.com/DebuggingNetworkManager or http://live.gnome.org/NetworkManager/Debugging for how you can do this. It seems to be missing from all the other bugs linked too, and can help figuring out what's happening once the RAs trigger the kernel error message you're seeing, and how it affects NetworkManager's state for the configuration.

[Mathieu Trudel-Lapierre (cyphermox)]

Marking as a duplicate of bug 988183.