*** This bug is a duplicate of bug 1098362 ***
    https://bugs.launchpad.net/bugs/1098362

See the duplicate bug: yes. You could mention your version there, if it
is newer.

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https://bugs.launchpad.net/bugs/1101182

Title:
  Shared Connection gets 10.42.0.X IP addresses even if those are taken

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  When you choose "Shared to other computers" in network-manager to
  create a network, the IP addresses are always 10.42.0.X. This is bad
  enough, but it doesn't check if those addresses are already in use on
  another interface, blowing up both networks and messing up routes.

  A fix would be to un-hardcode the addresses, but even warning/stopping
  the user from creating two networks with the same IPs would be better
  than the status quo.

  (In my setup one Ubuntu computer shares its network on a wired
  connection. Another Ubuntu computer tries to share that connection via
  WiFi. I'm not sure whether Network Manager warns if both the networks
  are created on the same computer.)

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: network-manager 0.9.6.0-0ubuntu7
  ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
  Uname: Linux 3.5.0-21-generic x86_64
  ApportVersion: 2.6.1-0ubuntu9
  Architecture: amd64
  Date: Fri Jan 18 14:48:24 2013
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2012-11-10 (69 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  IpRoute:
   default via 10.42.0.1 dev eth0  proto static 
   10.42.0.0/24 dev eth0  proto kernel  scope link  src 10.42.0.15  metric 1 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
  MarkForUpload: True
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                         
         
   eth0       802-3-ethernet    connected     
/org/freedesktop/NetworkManager/Devices/1  
   wlan0      802-11-wireless   disconnected  
/org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   
WIFI       WWAN-HARDWARE   WWAN      
   running         0.9.6.0    connected       enabled       enabled         
enabled    enabled         disabled

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