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[Alan Pope  <alan@xxxxxxxxxx>]

Public bug reported:

Thinkpad X220 in a docking station.
Wired ethernet connection on docking station enabled and connected & working. 
Wifi adapter in laptop is enabled and connected to same network.

In 14.10 I could have both enabled, and plug/unplug laptop to docking
station and everything "Just Works"

Since 15.04 I can't have both network devices enabled because the
network is unusable until I disable one of the devices.

Steps to reproduce:-

Connect laptop to wired and wifi
Reboot.
Login to desktop
Start pinging a remote host, e.g. 8.8.8.8.
Observe long (30s) drop-outs, then around 7-10 seconds of functional internet connection, then 30 seconds off again.

http://paste.ubuntu.com/10759863/

Note: no response between lines 2 and 3, 10 and 11, 18 and 19, 26 and 27
etc. Just before line 43 I disconnected from the wifi using the network
manager applet -> Disconnect menu item.

The system functions perfectly normally once wifi is disconnected.

Similarly I can disable wired connection and the system works fine.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.10.0-4ubuntu13
ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
Uname: Linux 3.19.0-12-generic x86_64
ApportVersion: 2.17-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Apr  7 10:10:42 2015
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2014-06-16 (294 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
IpRoute:
 default via 192.168.1.1 dev eth0  proto static  metric 1024 
 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.90 
 192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
SourcePackage: network-manager
UpgradeStatus: Upgraded to vivid on 2015-02-05 (60 days ago)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2014-09-25T11:02:51.660372
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1441053

Title:
  Two network adapters on same LAN causes 30s drop-outs

Status in network-manager package in Ubuntu:
  New

Bug description:
  Thinkpad X220 in a docking station.
  Wired ethernet connection on docking station enabled and connected & working. 
  Wifi adapter in laptop is enabled and connected to same network.

  In 14.10 I could have both enabled, and plug/unplug laptop to docking
  station and everything "Just Works"

  Since 15.04 I can't have both network devices enabled because the
  network is unusable until I disable one of the devices.

  Steps to reproduce:-

  Connect laptop to wired and wifi
  Reboot.
  Login to desktop
  Start pinging a remote host, e.g. 8.8.8.8.
  Observe long (30s) drop-outs, then around 7-10 seconds of functional internet connection, then 30 seconds off again.

  http://paste.ubuntu.com/10759863/

  Note: no response between lines 2 and 3, 10 and 11, 18 and 19, 26 and
  27 etc. Just before line 43 I disconnected from the wifi using the
  network manager applet -> Disconnect menu item.

  The system functions perfectly normally once wifi is disconnected.

  Similarly I can disable wired connection and the system works fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu13
  ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
  Uname: Linux 3.19.0-12-generic x86_64
  ApportVersion: 2.17-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Apr  7 10:10:42 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2014-06-16 (294 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static  metric 1024 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.90 
   192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to vivid on 2015-02-05 (60 days ago)
  mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2014-09-25T11:02:51.660372
  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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