Please reproduce the problem and run

    ip route show
    ls -l /etc/resolv.conf
    ls -l /run/resolvconf/interface
    cat /etc/resolv.conf

and post the output here.

** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1018740

Title:
  No network connectivity with 2 NICs -- Marvell 88E8056 sky2

Status in “network-manager” package in Ubuntu:
  Incomplete

Bug description:
  Clean install, machine has dual NICs.  Both NICs are connected to the
  same Gigabit switch getting configured via DHCP with the same Ubuntu
  ISC DHCP server but with (obviously) different configurations.

  There is no connectivity until I do an 'ifconfig down eth1' at which
  point the internet springs in to life.

  If I then do an 'ifconfig up eth1' it remains working.

  A logoff/on will produce the same results again.

  I will try Internet connectivity from the console on a restart and see
  if the issue occurs without Gnome/network-manager (in the near
  future).

  Regards
  Simon

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: network-manager 0.9.4.0-0ubuntu4.1
  ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Date: Thu Jun 28 08:51:50 2012
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: This
  IpRoute:
   default via 192.168.1.254 dev eth0  proto static
   169.254.0.0/16 dev eth0  scope link  metric 1000
   192.168.1.0/24 dev eth1  proto kernel  scope link  src 192.168.1.148  metric 
1
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.149  metric 
1
  IwConfig:
   lo        no wireless extensions.

   eth1      no wireless extensions.

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

  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   NAME                      UUID                                   TYPE        
      TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   
DBUS-PATH
   Wired connection 2        65059f71-097b-4718-a54f-50b17900020e   
802-3-ethernet    1340869884   Thu 28 Jun 2012 08:51:24 BST       yes           
no         /org/freedesktop/NetworkManager/Settings/1
   Wired connection 1        cf793b68-1e59-4531-8c47-91fc361b84ec   
802-3-ethernet    1340869884   Thu 28 Jun 2012 08:51:24 BST       yes           
no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH
   eth1       802-3-ethernet    connected     
/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         0.9.4.0    connected       enabled       enabled         
enabled    enabled         disabled

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