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[Bug 1497636] Re: Network disconnects sporadically

To: desktop-packages@xxxxxxxxxxxxxxxxxxx
From: Maxxer <maxxer@xxxxxxxxxx>
Date: Wed, 20 Jan 2016 08:36:37 -0000
Reply-to: Bug 1497636 <1497636@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
I also have networking problems on 15.10 but only on IPv6, I don't know if it can be related to this issue.
When I start the computer everything works, ipv4&6. After some time, which could be the DHCP renewal but I still have to verify, the IPv6 address is dropped by avahi (apparently). I experience no network disconnect, just address drop.

This wasn't happening on 15.04.

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https://bugs.launchpad.net/bugs/1497636

Title:
  Network disconnects sporadically

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  I installed Ubuntu 15.10 in VMware Workstation 12 Player to give it a
  try and I noticed that the network disconnects and reconnects every
  several minutes. I can't see this in other virtual machines or in the
  host machine (which runs Ubuntu 14.04 LTS). Here is a part of the
  syslog:

  Sep 19 14:04:49 ubuntu NetworkManager[725]: <info>  (eno16777736): link disconnected (deferring action for 4 seconds)
  Sep 19 14:04:49 ubuntu kernel: [ 6157.643978] e1000: eno16777736 NIC Link is Down
  Sep 19 14:04:53 ubuntu NetworkManager[725]: <info>  (eno16777736): link disconnected (calling deferred action)
  Sep 19 14:04:53 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: activated -> unavailable (reason 'carrier-changed') [100 20 40]
  Sep 19 14:04:53 ubuntu NetworkManager[725]: <info>  (eno16777736): canceled DHCP transaction, DHCP client pid 23002
  Sep 19 14:04:53 ubuntu NetworkManager[725]: <info>  (eno16777736): DHCPv4 state changed bound -> done
  Sep 19 14:04:53 ubuntu avahi-daemon[721]: Withdrawing address record for 172.16.110.138 on eno16777736.
  Sep 19 14:04:53 ubuntu avahi-daemon[721]: Leaving mDNS multicast group on interface eno16777736.IPv4 with address 172.16.110.138.
  Sep 19 14:04:53 ubuntu avahi-daemon[721]: Interface eno16777736.IPv4 no longer relevant for mDNS.
  Sep 19 14:04:53 ubuntu avahi-daemon[721]: Withdrawing address record for fe80::20c:29ff:fed8:4c0c on eno16777736.
  Sep 19 14:04:53 ubuntu avahi-daemon[721]: Leaving mDNS multicast group on interface eno16777736.IPv6 with address fe80::20c:29ff:fed8:4c0c.
  Sep 19 14:04:53 ubuntu avahi-daemon[721]: Interface eno16777736.IPv6 no longer relevant for mDNS.
  Sep 19 14:04:53 ubuntu NetworkManager[725]: <info>  Writing DNS information to /sbin/resolvconf
  Sep 19 14:04:53 ubuntu whoopsie[693]: [14:04:53] Cannot reach: https://daisy.ubuntu.com
  Sep 19 14:04:53 ubuntu whoopsie[693]: [14:04:53] Cannot reach: https://daisy.ubuntu.com
  Sep 19 14:04:53 ubuntu dnsmasq[829]: setting upstream servers from DBus
  Sep 19 14:04:53 ubuntu NetworkManager[725]: <info>  NetworkManager state is now CONNECTED_LOCAL
  Sep 19 14:04:53 ubuntu NetworkManager[725]: <info>  NetworkManager state is now DISCONNECTED
  Sep 19 14:04:53 ubuntu dbus[611]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
  Sep 19 14:04:53 ubuntu systemd[1]: Starting Network Manager Script Dispatcher Service...
  Sep 19 14:04:53 ubuntu dbus[611]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
  Sep 19 14:04:53 ubuntu systemd[1]: Started Network Manager Script Dispatcher Service.
  Sep 19 14:04:53 ubuntu nm-dispatcher: Dispatching action 'down' for eno16777736
  Sep 19 14:04:54 ubuntu gnome-session[2339]: (deja-dup-monitor:2783): GLib-CRITICAL **: Source ID 211 was not found when attempting to remove it
  Sep 19 14:04:54 ubuntu org.freedesktop.Notifications[2212]: ** Message: resizing pixbuf to 44
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): link connected
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
  Sep 19 14:04:55 ubuntu kernel: [ 6163.654550] e1000: eno16777736 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  Device 'eno16777736' has no connection; scheduling activate_check in 0 seconds.
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  Auto-activating connection 'Wired connection 1'.
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): Activation: starting connection 'Wired connection 1' (63e6e203-d873-4bdb-b106-bc9cf709d023)
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  NetworkManager state is now CONNECTING
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: prepare -> config (reason 'none') [40 50 0]
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: config -> ip-config (reason 'none') [50 70 0]
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  Activation (eno16777736) Beginning DHCPv4 transaction (timeout in 45 seconds)
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  dhclient started with pid 23200
  Sep 19 14:04:55 ubuntu dhclient: DHCPREQUEST of 172.16.110.138 on eno16777736 to 255.255.255.255 port 67 (xid=0x162927e3)
  Sep 19 14:04:55 ubuntu dhclient: DHCPACK of 172.16.110.138 from 172.16.110.254
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    address 172.16.110.138
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    plen 24 (255.255.255.0)
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    gateway 172.16.110.2
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    server identifier 172.16.110.254
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    lease time 1800
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    nameserver '172.16.110.2'
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    domain name 'localdomain'
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>    wins '172.16.110.2'
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): DHCPv4 state changed unknown -> bound
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: ip-config -> ip-check (reason 'none') [70 80 0]
  Sep 19 14:04:55 ubuntu avahi-daemon[721]: Joining mDNS multicast group on interface eno16777736.IPv4 with address 172.16.110.138.
  Sep 19 14:04:55 ubuntu avahi-daemon[721]: New relevant interface eno16777736.IPv4 for mDNS.
  Sep 19 14:04:55 ubuntu avahi-daemon[721]: Registering new address record for 172.16.110.138 on eno16777736.IPv4.
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: ip-check -> secondaries (reason 'none') [80 90 0]
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): device state change: secondaries -> activated (reason 'none') [90 100 0]
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  NetworkManager state is now CONNECTED_LOCAL
  Sep 19 14:04:55 ubuntu whoopsie[693]: [14:04:55] Cannot reach: https://daisy.ubuntu.com
  Sep 19 14:04:55 ubuntu whoopsie[693]: [14:04:55] Cannot reach: https://daisy.ubuntu.com
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  NetworkManager state is now CONNECTED_GLOBAL
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  Policy set 'Wired connection 1' (eno16777736) as default for IPv4 routing and DNS.
  Sep 19 14:04:55 ubuntu dnsmasq[829]: setting upstream servers from DBus
  Sep 19 14:04:55 ubuntu dnsmasq[829]: using nameserver 172.16.110.2#53
  Sep 19 14:04:55 ubuntu dhclient: bound to 172.16.110.138 -- renewal in 842 seconds.
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  Writing DNS information to /sbin/resolvconf
  Sep 19 14:04:55 ubuntu NetworkManager[725]: <info>  (eno16777736): Activation: successful, device activated.
  Sep 19 14:04:55 ubuntu nm-dispatcher: Dispatching action 'up' for eno16777736
  Sep 19 14:04:55 ubuntu whoopsie[693]: [14:04:55] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/5
  Sep 19 14:04:55 ubuntu whoopsie[693]: [14:04:55] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/5
  Sep 19 14:04:55 ubuntu whoopsie[693]: [14:04:55] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/5
  Sep 19 14:04:55 ubuntu org.freedesktop.Notifications[2212]: ** Message: resizing pixbuf to 44
  Sep 19 14:04:55 ubuntu gnome-session[2339]: (deja-dup-monitor:2783): GLib-CRITICAL **: Source ID 211 was not found when attempting to remove it
  Sep 19 14:04:55 ubuntu whoopsie[693]: [14:04:55] online
  Sep 19 14:04:56 ubuntu avahi-daemon[721]: Joining mDNS multicast group on interface eno16777736.IPv6 with address fe80::20c:29ff:fed8:4c0c.
  Sep 19 14:04:56 ubuntu avahi-daemon[721]: New relevant interface eno16777736.IPv6 for mDNS.
  Sep 19 14:04:56 ubuntu avahi-daemon[721]: Registering new address record for fe80::20c:29ff:fed8:4c0c on eno16777736.*.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: network-manager 1.0.4-0ubuntu3
  ProcVersionSignature: Ubuntu 4.2.0-10.12-generic 4.2.0
  Uname: Linux 4.2.0-10-generic x86_64
  ApportVersion: 2.18.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Sep 19 14:08:34 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2015-09-19 (0 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150919)
  IpRoute:
   default via 172.16.110.2 dev eno16777736  proto static  metric 100 
   169.254.0.0/16 dev eno16777736  scope link  metric 1000 
   172.16.110.0/24 dev eno16777736  proto kernel  scope link  src 172.16.110.138  metric 100
  IwConfig:
   eno16777736  no wireless extensions.
   
   lo        no wireless extensions.
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  RfKill:
   
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   NAME                UUID                                  TYPE            TIMESTAMP   TIMESTAMP-REAL                   AUTOCONNECT  AUTOCONNECT-PRIORITY  READONLY  DBUS-PATH                                   ACTIVE  DEVICE       STATE      ACTIVE-PATH                                        
   Wired connection 1  63e6e203-d873-4bdb-b106-bc9cf709d023  802-3-ethernet  1442696839  Sat 19 Sep 2015 02:07:19 PM PDT  yes          0                     no        /org/freedesktop/NetworkManager/Settings/0  yes     eno16777736  activated  /org/freedesktop/NetworkManager/ActiveConnection/5
  nmcli-dev:
   DEVICE       TYPE      STATE      DBUS-PATH                                  CONNECTION          CON-UUID                              CON-PATH                                           
   eno16777736  ethernet  connected  /org/freedesktop/NetworkManager/Devices/1  Wired connection 1  63e6e203-d873-4bdb-b106-bc9cf709d023  /org/freedesktop/NetworkManager/ActiveConnection/5 
   lo           loopback  unmanaged  /org/freedesktop/NetworkManager/Devices/0  --                  --                                    --
  nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

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References

[Bug 1497636] [NEW] Network disconnects sporadically
From: Kumbarov, 2015-09-19