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[Bug 1354733] Re: USB Modem permanently disconnects if there isn't constant network traffic

 

Since the mobile network no longer appears in the Network Manager till
you reconnect the modem, these are two different issues.

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https://bugs.launchpad.net/bugs/1354733

Title:
  USB Modem permanently disconnects if there isn't constant network
  traffic

Status in ModemManager (with NetworkManager support):
  New
Status in “modemmanager” package in Ubuntu:
  Triaged

Bug description:
  ****************
  HOW TO REPRODUCE
  ****************

  1. Connect the USB modem.
  2. Using the Network Manager, configure the mobile broadband network to connect automatically as soon as it's available.
  2. Use the Internet for a while.

  
  ******************
  EXPECTED BEHAVIOUR
  ******************

  - The Internet to stay connected.
  - If the Internet loses signal for a while, to automatically reconnect as specified in Network Manager.

  **************
  REAL BEHAVIOUR
  **************

  - Except if you are pinging a site each 5 second, the connection finishes going down forever.
  - The mobile network no longer appears in the Network Manager till you reconnect the modem.

  ***********
  WORK-AROUND
  ***********

  - In the "Terminal" application, to enter "ping google.com -i 5" and
  leave it open.

  ****************
  RELEVANT DETAILS
  ****************

  - The work-around has been borrowed from the "D-Link DWR-921" router,
  which has this option included in its interface to keep the connection
  alive.

  **************
  TECHNICAL INFO
  **************

  Modem model: Montseny Ballast WM72
  Modem provider: ISP
  Virtual ISP: Ono
  Real ISP: Movistar

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: modemmanager 1.0.0-2ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Aug  9 20:14:46 2014
  InstallationDate: Installed on 2013-01-25 (560 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  SourcePackage: modemmanager
  UpgradeStatus: Upgraded to trusty on 2014-04-28 (103 days ago)

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References