[Pkg-utopia-maintainers] Bug#755202: network-manager: keeps creating and using new connection "eth0" that does not work

[Fitzcarraldo]

I hope you don't mind me commenting again on a Debian bug report, but
this problem occurs across distributions and I think my comments may be
of some relevance to Debian users too.

I'm even more convinced the problem seen by some (not all) of the users
commenting in this thread is due to a bug in NetworkManager. I believe
the issue with Avahi daemon generating an IPv6 Link-Local address is a
consequence of NetworkManager not always activating an interface and
therefore not obtaining an IPv4 address, i.e. the IPv6 Link-Local
address produced by the Avahi daemon is a side effect, not the root cause.

After my previous comment (Message #136) I discovered that adding
"use-ipv6=false" in /etc/avahi/avahi-daemon.conf had not prevented
avahi-daemon using IPv6. However, adding the following lines in
/etc/avahi/avahi-daemon.conf defintely *does* prevent avahi-daemon from
using IPv6 in my installation:

use-ipv4=true
use-ipv6=false
publish-a-on-ipv6=no
publish-aaaa-on-ipv4=no

You can see in the message log output below that the Avahi daemon is no
longer generating an IPv6 Link-Local address. However, even with IPv6
disabled in avahi-daemon, the problem of a second eth0 connection with
an IPv6 Link-Local address still occurs in my installation. This
indicates the problem is not caused by the Avahi daemon.

Mar 18 22:17:31 localhost syslog-ng[8316]: syslog-ng starting up;
version='3.6.2'
Mar 18 22:17:32 localhost NetworkManager[8346]: <info>  NetworkManager
(version 1.0.0) is starting...
Mar 18 22:17:32 localhost NetworkManager[8346]: <info>  Read config:
/etc/NetworkManager/NetworkManager.conf
Mar 18 22:17:32 localhost NetworkManager[8346]: <info>  WEXT support is
enabled
Mar 18 22:17:34 localhost kernel: fglrx_pci 0000:01:00.0: irq 34 for
MSI/MSI-X
Mar 18 22:17:34 localhost kernel: <6>[fglrx] Firegl kernel thread PID: 8351
Mar 18 22:17:34 localhost kernel: <6>[fglrx] Firegl kernel thread PID: 8352
Mar 18 22:17:34 localhost kernel: <6>[fglrx] Firegl kernel thread PID: 8353
Mar 18 22:17:34 localhost kernel: <6>[fglrx] IRQ 34 Enabled
Mar 18 22:17:34 localhost kernel: <6>[fglrx] Reserved FB block: Shared
offset:0, size:1000000
Mar 18 22:17:34 localhost kernel: <6>[fglrx] Reserved FB block: Unshared
offset:f7e2000, size:4000
Mar 18 22:17:34 localhost kernel: <6>[fglrx] Reserved FB block: Unshared
offset:f7e6000, size:51a000
Mar 18 22:17:34 localhost kernel: <6>[fglrx] Reserved FB block: Unshared
offset:3fff3000, size:d000
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  Loaded plugin
keyfile: (c) 2007 - 2013 Red Hat, Inc.  To report bugs please use the
NetworkManager mailing list.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  new connection
/etc/NetworkManager/system-connections/Cisco00497
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  new connection
/etc/NetworkManager/system-connections/eth0
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  new connection
/etc/NetworkManager/system-connections/DIRECT-HeC460 Series
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  monitoring
kernel firmware directory '/lib/firmware'.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  rfkill0: found
WiFi radio killswitch (at
/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/ieee80211/phy0/rfkill0) (driver
iwlwifi)
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  WiFi hardware
radio set enabled
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  WWAN hardware
radio set enabled
Mar 18 22:17:33 localhost /etc/init.d/NetworkManager[8326]: WARNING:
NetworkManager has started, but is inactive
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  Loaded device
plugin: /usr/lib64/NetworkManager/libnm-device-plugin-bluetooth.so
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  Loaded device
plugin: /usr/lib64/NetworkManager/libnm-device-plugin-adsl.so
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  Loaded device
plugin: /usr/lib64/NetworkManager/libnm-device-plugin-wwan.so
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  Loaded device
plugin: /usr/lib64/NetworkManager/libnm-device-plugin-wifi.so
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  WiFi disabled by
radio killswitch; enabled by state file
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  WWAN enabled by
radio killswitch; enabled by state file
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  WiMAX enabled by
radio killswitch; enabled by state file
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  Networking is
enabled by state file
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (lo): link connected
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (lo): carrier is ON
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (lo): new
Generic device (driver: 'unknown' ifindex: 1)
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (lo): exported
as /org/freedesktop/NetworkManager/Devices/0
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): link
connected
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): carrier
is ON
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): new
Ethernet device (driver: 'atl1c' ifindex: 2)
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): exported
as /org/freedesktop/NetworkManager/Devices/1
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: unmanaged -> unavailable (reason 'connection-assumed') [10
20 41]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: unavailable -> disconnected (reason 'connection-assumed')
[20 30 41]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  startup complete
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: starting connection 'eth0'
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 1 of 5 (Device Prepare) scheduled...
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (wlan0): using
nl80211 for WiFi device control
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (wlan0): new
802.11 WiFi device (driver: 'iwlwifi' ifindex: 3)
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (wlan0):
exported as /org/freedesktop/NetworkManager/Devices/2
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (wlan0): device
state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (wlan0):
preparing device
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 1 of 5 (Device Prepare) started...
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: disconnected -> prepare (reason 'none') [30 40 0]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 2 of 5 (Device Configure) scheduled...
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 1 of 5 (Device Prepare) complete.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 2 of 5 (Device Configure) starting...
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: prepare -> config (reason 'none') [40 50 0]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 2 of 5 (Device Configure) successful.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 3 of 5 (IP Configure Start) scheduled.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 2 of 5 (Device Configure) complete.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 3 of 5 (IP Configure Start) started...
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: config -> ip-config (reason 'none') [50 70 0]
Mar 18 22:17:33 localhost dbus[7763]: [system] Activating service
name='org.freedesktop.ModemManager1' (using servicehelper)
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 5 of 5 (IPv6 Commit) scheduled...
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 3 of 5 (IP Configure Start) complete.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 5 of 5 (IPv6 Commit) started...
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: ip-config -> ip-check (reason 'none') [70 80 0]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0):
Activation: Stage 5 of 5 (IPv6 Commit) complete.
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: ip-check -> secondaries (reason 'none') [80 90 0]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  (eth0): device
state change: secondaries -> activated (reason 'none') [90 100 0]
Mar 18 22:17:33 localhost NetworkManager[8346]: <info>  NetworkManager
state is now CONNECTED_LOCAL
Mar 18 22:17:33 localhost acpid[8386]: starting up with netlink and the
input layer
Mar 18 22:17:33 localhost acpid[8386]: 6 rules loaded
Mar 18 22:17:33 localhost acpid[8386]: waiting for events: event logging
is off
Mar 18 22:17:34 localhost ModemManager[8385]: <info>  ModemManager
(version 1.4.2) starting in system bus...
Mar 18 22:17:34 localhost NetworkManager[8346]: <info>  (eth0):
Activation: successful, device activated.
Mar 18 22:17:34 localhost dbus[7763]: [system] Activating service
name='org.freedesktop.nm_dispatcher' (using servicehelper)
Mar 18 22:17:34 localhost dbus[7763]: [system] Successfully activated
service 'org.freedesktop.nm_dispatcher'
Mar 18 22:17:34 localhost nm-dispatcher[8435]: Dispatching action 'up'
for eth0
Mar 18 22:17:34 localhost rpc.statd[8451]: Version 1.3.2 starting
Mar 18 22:17:34 localhost rpc.statd[8451]: Flags: TI-RPC
Mar 18 22:17:34 localhost /etc/init.d/NetworkManager[8457]: status: inactive
Mar 18 22:17:34 localhost rpc.statd[8451]: Running as root.  chown
/var/lib/nfs to choose different user
Mar 18 22:17:34 localhost /etc/init.d/NetworkManager[8469]: status: inactive
Mar 18 22:17:34 localhost dbus[7763]: [system] Successfully activated
service 'org.freedesktop.ModemManager1'
Mar 18 22:17:34 localhost NetworkManager[8346]: <info>  ModemManager
disappeared from bus
Mar 18 22:17:34 localhost NetworkManager[8346]: <info>  ModemManager
available in the bus
Mar 18 22:17:35 localhost sm-notify[8556]: Version 1.3.2 starting
Mar 18 22:17:35 localhost avahi-daemon[8585]: Found user 'avahi' (UID
108) and group 'avahi' (GID 444).
Mar 18 22:17:35 localhost avahi-daemon[8585]: Successfully dropped root
privileges.
Mar 18 22:17:35 localhost avahi-daemon[8585]: avahi-daemon 0.6.31
starting up.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Successfully called chroot().
Mar 18 22:17:35 localhost avahi-daemon[8585]: Successfully dropped
remaining capabilities.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Loading service file
/services/sftp-ssh.service.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Loading service file
/services/ssh.service.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Network interface
enumeration completed.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Registering HINFO record
with values 'X86_64'/'LINUX'.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Server startup complete.
Host name is meshedgedx.local. Local service cookie is 3778762828.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Service "meshedgedx"
(/services/ssh.service) successfully established.
Mar 18 22:17:35 localhost avahi-daemon[8585]: Service "meshedgedx"
(/services/sftp-ssh.service) successfully established.
Mar 18 22:17:35 localhost ntpd[8645]: ntpd 4.2.8 at 1.3265-o Wed  4 Mar
02:23:30 UTC 2015 (1): Starting
Mar 18 22:17:35 localhost ntpd[8645]: Command line: ntpd -g -q
Mar 18 22:17:35 localhost ntpd[8645]: proto: precision = 0.061 usec (-24)
Mar 18 22:17:35 localhost ntpd[8645]: Listen and drop on 0 v6wildcard
[::]:123
Mar 18 22:17:35 localhost ntpd[8645]: Listen and drop on 1 v4wildcard
0.0.0.0:123
Mar 18 22:17:35 localhost ntpd[8645]: Listen normally on 2 lo 127.0.0.1:123
Mar 18 22:17:35 localhost ntpd[8645]: Listen normally on 3 lo [::1]:123
Mar 18 22:17:35 localhost ntpd[8645]: Listen normally on 4 eth0
[fe80::725a:b6ff:fe3e:c18a%2]:123
Mar 18 22:17:35 localhost ntpd[8645]: Listening on routing socket on fd
#21 for interface updates
Mar 18 22:17:36 localhost kernel: fbcondecor: console 1 using theme
'Emergance'
Mar 18 22:17:37 localhost kernel: fbcondecor: switched decor state to
'on' on console 1
Mar 18 22:17:37 localhost kernel: fbcondecor: console 2 using theme
'Emergance'
Mar 18 22:17:37 localhost kernel: fbcondecor: switched decor state to
'on' on console 2
Mar 18 22:17:37 localhost kernel: fbcondecor: console 3 using theme
'Emergance'
Mar 18 22:17:37 localhost kernel: fbcondecor: switched decor state to
'on' on console 3
Mar 18 22:17:37 localhost kernel: fbcondecor: console 4 using theme
'Emergance'
Mar 18 22:17:37 localhost kernel: fbcondecor: switched decor state to
'on' on console 4
Mar 18 22:17:37 localhost kernel: fbcondecor: console 5 using theme
'Emergance'
Mar 18 22:17:37 localhost kernel: fbcondecor: switched decor state to
'on' on console 5
Mar 18 22:17:36 localhost bluetoothd[8787]: Bluetooth daemon 5.28
Mar 18 22:17:36 localhost bluetoothd[8787]: Starting SDP server
Mar 18 22:17:37 localhost kernel: Bluetooth: Core ver 2.19
Mar 18 22:17:37 localhost kernel: NET: Registered protocol family 31
Mar 18 22:17:37 localhost kernel: Bluetooth: HCI device and connection
manager initialized
Mar 18 22:17:37 localhost kernel: Bluetooth: HCI socket layer initialized
Mar 18 22:17:37 localhost kernel: Bluetooth: L2CAP socket layer initialized
Mar 18 22:17:37 localhost kernel: Bluetooth: SCO socket layer initialized
Mar 18 22:17:38 localhost kernel: Bluetooth: BNEP (Ethernet Emulation)
ver 1.3
Mar 18 22:17:38 localhost kernel: Bluetooth: BNEP filters: protocol
multicast
Mar 18 22:17:38 localhost kernel: Bluetooth: BNEP socket layer initialized
Mar 18 22:17:36 localhost bluetoothd[8787]: Bluetooth management
interface 1.7 initialized
Mar 18 22:17:36 localhost NetworkManager[8346]: <info>  use BlueZ version 5
Mar 18 22:17:37 localhost ModemManager[8385]: <warn>  Couldn't find
support for device at
'/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0': not supported by
any plugin
Mar 18 22:17:37 localhost ModemManager[8385]: <warn>  Couldn't find
support for device at
'/sys/devices/pci0000:00/0000:00:1c.2/0000:04:00.0': not supported by
any plugin
Mar 18 22:17:39 localhost dbus[7763]: [system] Activating service
name='org.freedesktop.ColorManager' (using servicehelper)
Mar 18 22:17:39 localhost dbus[7763]: [system] Successfully activated
service 'org.freedesktop.ColorManager'
Mar 18 22:17:41 localhost kernel: nf_conntrack: automatic helper
assignment is deprecated and it will be removed soon. Use the iptables
CT target to attach helpers instead.
Mar 18 22:17:43 localhost kernel: [UFW BLOCK] IN=eth0 OUT= MAC=
SRC=fe80:0000:0000:0000:725a:b6ff:fe3e:c18a
DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=64 TC=0 HOPLIMIT=1
FLOWLBL=0 PROTO=UDP SPT=8612 DPT=8612 LEN=24
Mar 18 22:17:43 localhost kernel: [UFW BLOCK] IN=eth0 OUT= MAC=
SRC=fe80:0000:0000:0000:725a:b6ff:fe3e:c18a
DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=64 TC=0 HOPLIMIT=1
FLOWLBL=0 PROTO=UDP SPT=8612 DPT=8612 LEN=24
Mar 18 22:17:43 localhost laptop-mode[8947]: Laptop mode
Mar 18 22:17:43 localhost laptop-mode[8948]: enabled, not active
Mar 18 22:17:58 localhost kernel: Installing knfsd (copyright (C) 1996
okir at monad.swb.de).
Mar 18 22:17:58 localhost rpc.mountd[9741]: Version 1.3.2 starting
Mar 18 22:17:59 localhost kernel: NFSD: Using /var/lib/nfs/v4recovery as
the NFSv4 state recovery directory
Mar 18 22:17:59 localhost kernel: NFSD: starting 90-second grace period
(net ffffffff81c3d580)
Mar 18 22:17:58 localhost sm-notify[9760]: Version 1.3.2 starting
Mar 18 22:17:58 localhost sm-notify[9760]: Already notifying clients;
Exiting!
Mar 18 22:18:00 localhost sshd[9816]: Server listening on 0.0.0.0 port 22.
Mar 18 22:18:00 localhost sshd[9816]: Server listening on :: port 22.
Mar 18 22:18:00 localhost cron[9870]: (CRON) STARTUP (V5.0)
Mar 18 22:18:00 localhost su[9899]: Successful su for fitzcarraldo by root
Mar 18 22:18:00 localhost su[9899]: + /dev/console root:fitzcarraldo
Mar 18 22:18:00 localhost su[9899]: pam_unix(su:session): session opened
for user fitzcarraldo by (uid=0)
Mar 18 22:18:01 localhost dbus[7763]: [system] Activating service
name='org.freedesktop.RealtimeKit1' (using servicehelper)
Mar 18 22:18:01 localhost dbus[7763]: [system] Successfully activated
service 'org.freedesktop.RealtimeKit1'
Mar 18 22:18:01 localhost rtkit-daemon[9906]: Successfully called chroot.
Mar 18 22:18:01 localhost rtkit-daemon[9906]: Successfully dropped
privileges.
Mar 18 22:18:01 localhost rtkit-daemon[9906]: Successfully limited
resources.
Mar 18 22:18:01 localhost rtkit-daemon[9906]: Running.
Mar 18 22:18:01 localhost rtkit-daemon[9906]: Watchdog thread running.
Mar 18 22:18:01 localhost rtkit-daemon[9906]: Canary thread running.
Mar 18 22:18:01 localhost kdm[8833]: :0[8833]: pam_unix(kde:session):
session opened for user fitzcarraldo by (uid=0)
Mar 18 22:18:01 localhost kdm[8833]: :0[8833]:
pam_ck_connector(kde:session): nox11 mode, ignoring PAM_TTY :0
Mar 18 22:18:03 localhost pulseaudio[9904]: [pulseaudio] sink.c: Default
and alternate sample rates are the same.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost pulseaudio[9904]: [pulseaudio] source.c:
Default and alternate sample rates are the same.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost rtkit-daemon[9906]: Supervising 0 threads of 0
processes of 1 users.
Mar 18 22:18:03 localhost pulseaudio[9904]: [pulseaudio]
module-jackdbus-detect.c: Unable to contact D-Bus session bus:
org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a
dbus-daemon without a $DISPLAY for X11
Mar 18 22:18:03 localhost pulseaudio[9904]: [pulseaudio] module.c:
Failed to load module "module-jackdbus-detect" (argument: "channels=2"):
initialization failed.
Mar 18 22:18:04 localhost pulseaudio[9904]: [pulseaudio] main.c: Module
load failed.
Mar 18 22:18:04 localhost pulseaudio[9904]: [pulseaudio]
server-lookup.c: Unable to contact D-Bus:
org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a
dbus-daemon without a $DISPLAY for X11
Mar 18 22:18:04 localhost pulseaudio[9904]: [pulseaudio] main.c: Unable
to contact D-Bus: org.freedesktop.DBus.Error.NotSupported: Unable to
autolaunch a dbus-daemon without a $DISPLAY for X11
Mar 18 22:18:04 localhost su[9899]: pam_unix(su:session): session closed
for user fitzcarraldo
Mar 18 22:18:04 localhost su[9964]: Successful su for fitzcarraldo by root
Mar 18 22:18:04 localhost su[9964]: + /dev/console root:fitzcarraldo
Mar 18 22:18:04 localhost su[9964]: pam_unix(su:session): session opened
for user fitzcarraldo by (uid=0)
Mar 18 22:18:04 localhost su[9964]: pam_unix(su:session): session closed
for user fitzcarraldo
Mar 18 22:18:04 localhost su[9966]: Successful su for fitzcarraldo by root
Mar 18 22:18:04 localhost su[9966]: + /dev/console root:fitzcarraldo
Mar 18 22:18:04 localhost su[9966]: pam_unix(su:session): session opened
for user fitzcarraldo by (uid=0)
Mar 18 22:18:04 localhost su[9966]: pam_unix(su:session): session closed
for user fitzcarraldo
Mar 18 22:18:04 localhost su[9968]: Successful su for fitzcarraldo by root
Mar 18 22:18:04 localhost su[9968]: + /dev/console root:fitzcarraldo
Mar 18 22:18:04 localhost su[9968]: pam_unix(su:session): session opened
for user fitzcarraldo by (uid=0)
Mar 18 22:18:04 localhost su[9968]: pam_unix(su:session): session closed
for user fitzcarraldo
Mar 18 22:18:15 localhost dbus[7763]: [system] Activating service
name='org.freedesktop.UPower' (using servicehelper)
Mar 18 22:18:15 localhost dbus[7763]: [system] Successfully activated
service 'org.freedesktop.UPower'
Mar 18 22:18:17 localhost dbus[7763]: [system] Activating service
name='org.freedesktop.UDisks2' (using servicehelper)
Mar 18 22:18:17 localhost udisksd[10120]: udisks daemon version 2.1.4
starting
Mar 18 22:18:17 localhost dbus[7763]: [system] Successfully activated
service 'org.freedesktop.UDisks2'
Mar 18 22:18:17 localhost udisksd[10120]: Acquired the name
org.freedesktop.UDisks2 on the system message bus
Mar 18 22:18:19 localhost kernel: [UFW BLOCK] IN=eth0 OUT=
MAC=01:00:5e:00:00:01:00:16:fa:25:28:01:08:00 SRC=0.0.0.0 DST=224.0.0.1
LEN=36 TOS=0x00 PREC=0xC0 TTL=1 ID=0 PROTO=2
Mar 18 22:18:54 localhost hp-systray[10453]: hp-systray[10453]: error:
option -s not recognized
Mar 18 22:18:55 localhost rtkit-daemon[9906]: Successfully made thread
10469 of process 10469 (/usr/bin/pulseaudio) owned by '1000' high
priority at nice level -11.
Mar 18 22:18:55 localhost rtkit-daemon[9906]: Supervising 1 threads of 1
processes of 1 users.
Mar 18 22:18:55 localhost pulseaudio[10469]: [pulseaudio] pid.c: Daemon
already running.
Mar 18 22:18:56 localhost rtkit-daemon[9906]: Successfully made thread
10485 of process 10485 (/usr/bin/pulseaudio) owned by '1000' high
priority at nice level -11.
Mar 18 22:18:56 localhost rtkit-daemon[9906]: Supervising 1 threads of 1
processes of 1 users.
Mar 18 22:18:56 localhost pulseaudio[10485]: [pulseaudio] pid.c: Daemon
already running.
Mar 18 22:19:04 localhost polkitd[7911]: Registered Authentication Agent
for unix-session:/org/freedesktop/ConsoleKit/Session1 (system bus name
:1.52 [/usr/lib64/kde4/libexec/polkit-kde-authentication-agent-1],
object path /org/kde/PolicyKit1/AuthenticationAgent, locale en_GB.UTF-8)
Mar 18 22:19:10 localhost su[10569]: Successful su for root by fitzcarraldo
Mar 18 22:19:10 localhost su[10569]: + /dev/pts/0 fitzcarraldo:root
Mar 18 22:19:10 localhost su[10569]: pam_unix(su:session): session
opened for user root by fitzcarraldo(uid=1000)
Mar 18 22:19:26 localhost pulseaudio[9904]: [alsa-sink-ALC272 Analog]
alsa-sink.c: ALSA woke us up to write new data to the device, but there
was actually nothing to write!
Mar 18 22:19:26 localhost pulseaudio[9904]: [alsa-sink-ALC272 Analog]
alsa-sink.c: Most likely this is a bug in the ALSA driver
'snd_hda_intel'. Please report this issue to the ALSA developers.
Mar 18 22:19:26 localhost pulseaudio[9904]: [alsa-sink-ALC272 Analog]
alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent
snd_pcm_avail() returned 0 or another value < min_avail.
Mar 18 22:20:01 localhost cron[10670]: (root) CMD (test -x
/usr/sbin/run-crons && /usr/sbin/run-crons)

In the cases when NetworkManager activates a connection correctly and
there is no invalid second eth0 connection, the log contains a message
like the following:

Mar 16 22:23:47 localhost NetworkManager[6688]: <info>  Auto-activating
connection 'eth0'.

Notice there is no such message in the message log output listed above.

The only way I can be sure of preventing NetworkManager creating an
invalid second eth0 connection is to disable IPv6 system-wide by
uncommenting the line "alias net-pf-10 off" in the file
/etc/modprobe.d/aliases.conf.

So, to me, this looks like a bug in NetworkManager.

By the way, in my previous comment (Message #136) I quoted the wrong
contents of my NetworkManager.conf file. In fact the contents are as
follows:

[main]
plugins=keyfile
dhcp=dhcpcd
no-auto-default=eth0

[keyfile]
hostname=meshedgedx