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[Bug 1499739] Re: NetworkManager should check for Internet connection


Unfortunately this is the way NetworkManager works.  It's goal is to
establish a network connection using the highest priority device and
connection available.  Success is defined as connection established and
networking configuration successful ( ie. IP address assigned, routing
table setup, ... ).

NetworkManager does support a feature called 'connectivity checking',
see the following blog post ( look for the conf directive:
"[connectivity]" ):


That said, it's currently disabled as when first tested on Ubuntu, it
didn't work that reliably, so it was never enabled by default.  It's a
bit too late to make this change in wily, so maybe this is something
that should be explored for 16.04?  That said, if you feel like this is
important enough, please raise it with someone from the product team.

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  NetworkManager should check for Internet connection

Status in network-manager package in Ubuntu:

Bug description:
  Have SIM with bad data plan.*
  Wi-FI OFF.
  Cellular data ON (and ofono reports Attached = 1)
  $ gdbus call -e -d com.ubuntu.connectivity1 -o /com/ubuntu/connectivity1/NetworkingStatus -m org.freedesktop.DBus.Properties.Get com.ubuntu.connectivity1.NetworkingStatus Status

  What happens
  (<uint32 70>,) (NM_STATE_CONNECTED_GLOBAL) [1]

  What should happen:
  (<uint32 20>,) (NM_STATE_DISCONNECTED) [1]

  This assumes that NetworkManager's State property definition of
  “Connected” is equal to “Connected to the Internet”. If it's not, then
  this needs to be resolved elsewhere.

  * Not sure what the exact definition of a bad data plan is, but assume
  “out of cash”, but ofono still attaches.

  [1] https://developer.gnome.org/NetworkManager/0.9/spec.html#type-

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