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[Bug 1319805] Re: DNS confused with multiple interfaces (eth/wlan)

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A workaround may be to edit /etc/NetworkManager/NetworkManager.conf and
comment out the line "dns=dnsmasq".

** Description changed:

- Using a laptop with a hardware switch for enable/disable WLAN.
- Connected to two different LANs using DHCP on ETH/WLAN.
+ I have a laptop with a hardware switch to enable or disable the WLAN
+ interface.
  
- When both interfaces are active (in different networks), the system uses the LAN interface as the default route as expected.
- But it does not use the the nameserver on that interface consistently.
- It often tries to use the WLAN nameserver which leads to trouble as the WLAN nameserver does not know about the hosts on the LAN.
+ I am connected to two different LANs using DHCP via eth and wlan,
+ respectively.
+ 
+ When both interfaces are active (in different networks), the system uses
+ the LAN interface as the default route as expected.
+ 
+ However, it does not use the the nameserver on that interface
+ consistently. It often tries to use the WLAN nameserver which leads to
+ trouble as the WLAN nameserver does not know about the hosts on the LAN.
  
  The nameserver should be taken from the same interface as the default
  route to avoid messups.
  
  Ubuntu 12.04 did not have that behavior.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: network-manager 0.9.8.8-0ubuntu7
  Uname: Linux 3.15.0-031500rc2-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu May 15 14:28:46 2014
  IfupdownConfig:
-  # interfaces(5) file used by ifup(8) and ifdown(8)
-  auto lo
-  iface lo inet loopback
+  # interfaces(5) file used by ifup(8) and ifdown(8)
+  auto lo
+  iface lo inet loopback
  InstallationDate: Installed on 2014-04-24 (20 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  IpRoute:
-  default via 10.1.1.254 dev eth0  proto static 
-  8.0.0.0/24 dev vboxnet0  proto kernel  scope link  src 8.0.0.1 
-  10.1.1.0/24 dev eth0  proto kernel  scope link  src 10.1.1.42  metric 1
+  default via 10.1.1.254 dev eth0  proto static
+  8.0.0.0/24 dev vboxnet0  proto kernel  scope link  src 8.0.0.1
+  10.1.1.0/24 dev eth0  proto kernel  scope link  src 10.1.1.42  metric 1
  NetworkManager.state:
-  [main]
-  NetworkingEnabled=true
-  WirelessEnabled=true
-  WWANEnabled=true
-  WimaxEnabled=true
+  [main]
+  NetworkingEnabled=true
+  WirelessEnabled=true
+  WWANEnabled=true
+  WimaxEnabled=true
  RfKill:
-  0: phy0: Wireless LAN
-  	Soft blocked: yes
-  	Hard blocked: yes
+  0: phy0: Wireless LAN
+   Soft blocked: yes
+   Hard blocked: yes
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2014-04-30T15:18:11.879306
  nmcli-con:
-  NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH                                 
-  Wired connection 1        58608da7-d199-4c51-a8f4-a7913363637f   802-3-ethernet    1400156985   Do 15 Mai 2014 14:29:45 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/2
-  afxhome                   213a5a1b-daf7-4b28-b682-6c8934b20e4d   802-11-wireless   1400132352   Do 15 Mai 2014 07:39:12 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/1
-  AtSec guest               6d860806-d458-4de0-bfcb-8e40c2185437   802-11-wireless   1400141574   Do 15 Mai 2014 10:12:54 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/0
+  NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH
+  Wired connection 1        58608da7-d199-4c51-a8f4-a7913363637f   802-3-ethernet    1400156985   Do 15 Mai 2014 14:29:45 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/2
+  afxhome                   213a5a1b-daf7-4b28-b682-6c8934b20e4d   802-11-wireless   1400132352   Do 15 Mai 2014 07:39:12 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/1
+  AtSec guest               6d860806-d458-4de0-bfcb-8e40c2185437   802-11-wireless   1400141574   Do 15 Mai 2014 10:12:54 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
-  DEVICE     TYPE              STATE         DBUS-PATH                                  
-  wlan0      802-11-wireless   unavailable   /org/freedesktop/NetworkManager/Devices/1  
-  eth0       802-3-ethernet    connected     /org/freedesktop/NetworkManager/Devices/0
+  DEVICE     TYPE              STATE         DBUS-PATH
+  wlan0      802-11-wireless   unavailable   /org/freedesktop/NetworkManager/Devices/1
+  eth0       802-3-ethernet    connected     /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
-  RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
-  running         0.9.8.8    connected       enabled       disabled        disabled   enabled         enabled
+  RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN
+  running         0.9.8.8    connected       enabled       disabled        disabled   enabled         enabled

-- 
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https://bugs.launchpad.net/bugs/1319805

Title:
  DNS confused with multiple interfaces (eth/wlan)

Status in network-manager package in Ubuntu:
  New

Bug description:
  I have a laptop with a hardware switch to enable or disable the WLAN
  interface.

  I am connected to two different LANs using DHCP via eth and wlan,
  respectively.

  When both interfaces are active (in different networks), the system
  uses the LAN interface as the default route as expected.

  However, it does not use the the nameserver on that interface
  consistently. It often tries to use the WLAN nameserver which leads to
  trouble as the WLAN nameserver does not know about the hosts on the
  LAN.

  The nameserver should be taken from the same interface as the default
  route to avoid messups.

  Ubuntu 12.04 did not have that behavior.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: network-manager 0.9.8.8-0ubuntu7
  Uname: Linux 3.15.0-031500rc2-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu May 15 14:28:46 2014
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2014-04-24 (20 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  IpRoute:
   default via 10.1.1.254 dev eth0  proto static
   8.0.0.0/24 dev vboxnet0  proto kernel  scope link  src 8.0.0.1
   10.1.1.0/24 dev eth0  proto kernel  scope link  src 10.1.1.42  metric 1
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: yes
    Hard blocked: yes
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2014-04-30T15:18:11.879306
  nmcli-con:
   NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH
   Wired connection 1        58608da7-d199-4c51-a8f4-a7913363637f   802-3-ethernet    1400156985   Do 15 Mai 2014 14:29:45 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/2
   afxhome                   213a5a1b-daf7-4b28-b682-6c8934b20e4d   802-11-wireless   1400132352   Do 15 Mai 2014 07:39:12 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/1
   AtSec guest               6d860806-d458-4de0-bfcb-8e40c2185437   802-11-wireless   1400141574   Do 15 Mai 2014 10:12:54 CEST       yes           no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH
   wlan0      802-11-wireless   unavailable   /org/freedesktop/NetworkManager/Devices/1
   eth0       802-3-ethernet    connected     /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN
   running         0.9.8.8    connected       enabled       disabled        disabled   enabled         enabled

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