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[Bug 1406077] [NEW] Having two network interfaces causes internet traffic to cease on boot

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Public bug reported:

What is expected to happen in a new Vivid virtualbox guest from a Trusty
host is one clicks in vbox File > Preferences > Network > Host-only
Networks > click plus icon to Add host-only network > IPv4 Address:
192.168.56.1 > IPv4 Network Mask: 255.255.255.0 > IPv6 Address:
fe80:0000:0000:0000:0800:27ff:fe00:0000 > IPv6 Network Mask Length: 64 >
tab DHCP Server > uncheck Enable Server > OK >  highlight Vivid guest >
Settings > Network > tab Adapter 1 > Attached to: NAT (leave all other
settings as default) > tab Adapter 2 > check Enable Network Adapter >
Attached to: Host-only Adapter (leave defaults) > Check Enable Network
Adapter > OK.

Start the Vivd guest and login > top right of screen secondary click
Network Manager icon in the taskbar > Settings... > highlight WIred
Connection 1 > Edit > tab IPv4 Settings > button Add > Address
192.168.56.4 > Netmask 255.255.255.0 > Gateway 192.168.56.1 > Save >
restart and NAT traffic through Wired Connection 1 works.

What happens instead is it doesn't. This also happens if one saves the machine state, and resumes it. Things I've tested:
- This didn't happen in 12.04.5 with the same kernel as in Vivid, so this is a regression from at least Precise.
- In Vivid I've tested kernel 3.2, and 3.19-rc1 and the same problem was reproducible, so this isn't a linux kernel issue.
- I tried upgrading the version of virtualbox from default 4.3.10 to 4.3.20, no change.

WORKAROUND: Click Network Manager icon in the taskbar > click Wired
connection 2, which will disable it. Then, click it again to re-enable.
This will allow for both the NAT traffic to begin working again, and the
host-only traffic will work.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.8.8-0ubuntu34
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.15.1-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Dec 28 03:48:31 2014
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2014-12-14 (14 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141213)
IpRoute:
 default via 10.0.2.2 dev eth0  proto static 
 10.0.2.0/24 dev eth0  proto kernel  scope link  src 10.0.2.15  metric 1
IwConfig:
 eth0      no wireless extensions.
 
 eth1      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)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2014-12-26T05:59:48.680074
nmcli-con:
 NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH                                 
 Wired connection 1        c877b163-ed83-464c-92b2-e56fdeefc0b4   802-3-ethernet    1419760097   Sun 28 Dec 2014 03:48:17 AM CST    yes           no         /org/freedesktop/NetworkManager/Settings/1
 Wired connection 2        a12f34d9-04d3-44d3-aa0d-7bbbbeb90c3f   802-3-ethernet    1419663760   Sat 27 Dec 2014 01:02:40 AM CST    yes           no         /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
 DEVICE     TYPE              STATE         DBUS-PATH                                  
 eth1       802-3-ethernet    disconnected  /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       enabled         enabled    enabled         disabled

** Affects: network-manager (Ubuntu)
     Importance: Low
         Status: Triaged


** Tags: amd64 apport-bug regression-release 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/1406077

Title:
  Having two network interfaces causes internet traffic to cease on boot

Status in network-manager package in Ubuntu:
  Triaged

Bug description:
  What is expected to happen in a new Vivid virtualbox guest from a
  Trusty host is one clicks in vbox File > Preferences > Network > Host-
  only Networks > click plus icon to Add host-only network > IPv4
  Address: 192.168.56.1 > IPv4 Network Mask: 255.255.255.0 > IPv6
  Address: fe80:0000:0000:0000:0800:27ff:fe00:0000 > IPv6 Network Mask
  Length: 64 > tab DHCP Server > uncheck Enable Server > OK >  highlight
  Vivid guest > Settings > Network > tab Adapter 1 > Attached to: NAT
  (leave all other settings as default) > tab Adapter 2 > check Enable
  Network Adapter > Attached to: Host-only Adapter (leave defaults) >
  Check Enable Network Adapter > OK.

  Start the Vivd guest and login > top right of screen secondary click
  Network Manager icon in the taskbar > Settings... > highlight WIred
  Connection 1 > Edit > tab IPv4 Settings > button Add > Address
  192.168.56.4 > Netmask 255.255.255.0 > Gateway 192.168.56.1 > Save >
  restart and NAT traffic through Wired Connection 1 works.

  What happens instead is it doesn't. This also happens if one saves the machine state, and resumes it. Things I've tested:
  - This didn't happen in 12.04.5 with the same kernel as in Vivid, so this is a regression from at least Precise.
  - In Vivid I've tested kernel 3.2, and 3.19-rc1 and the same problem was reproducible, so this isn't a linux kernel issue.
  - I tried upgrading the version of virtualbox from default 4.3.10 to 4.3.20, no change.

  WORKAROUND: Click Network Manager icon in the taskbar > click Wired
  connection 2, which will disable it. Then, click it again to re-
  enable. This will allow for both the NAT traffic to begin working
  again, and the host-only traffic will work.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.8.8-0ubuntu34
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.15.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Dec 28 03:48:31 2014
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2014-12-14 (14 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141213)
  IpRoute:
   default via 10.0.2.2 dev eth0  proto static 
   10.0.2.0/24 dev eth0  proto kernel  scope link  src 10.0.2.15  metric 1
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      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)
  mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2014-12-26T05:59:48.680074
  nmcli-con:
   NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH                                 
   Wired connection 1        c877b163-ed83-464c-92b2-e56fdeefc0b4   802-3-ethernet    1419760097   Sun 28 Dec 2014 03:48:17 AM CST    yes           no         /org/freedesktop/NetworkManager/Settings/1
   Wired connection 2        a12f34d9-04d3-44d3-aa0d-7bbbbeb90c3f   802-3-ethernet    1419663760   Sat 27 Dec 2014 01:02:40 AM CST    yes           no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                                  
   eth1       802-3-ethernet    disconnected  /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       enabled         enabled    enabled         disabled

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