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[Bug Watch Updater <1090543@xxxxxxxxxxxxxxxxxx>]

** Changed in: network-manager-applet
       Status: Unknown => Invalid

** Changed in: network-manager-applet
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1090543

Title:
  Slow traffic pass through "disconnected" wired connection

Status in Network Manager GNOME Applet:
  Invalid
Status in “network-manager-applet” package in Ubuntu:
  Confirmed

Bug description:
  I was doing a fresh install of 12.04 on my desktop PC, which is
  connected to my home network. I have installed the Gnome3 classic
  desktop environment, and while doing some configurations, I decided to
  disconnect from the network in order to protect my PC while it is
  still in a vulnerable state. (I have noticed for some time before that
  one of the other PC's on the LAN, with a Win 7 OS, is somewhat noisy
  on the network).

  When installing the System Monitor applet, I also activated the
  Network portion, taking samples at 1.5 second intervals on the network
  connection, and producing a small graph (60 pixels wide) showing the
  network traffic. I then noticed that traffic was still getting through
  at a rate of 40 bytes/sec on the now "disconnected" wired connection.

  I then did a few tests, and found:
  - for some reason there is also the option of "Disabling" the network on the applet.
  - both "Disconnect" and "Disable" produce the same message "Disconnected - you are now offline".
  - "Disconnecting" the wired connection, with the network "Enabled" still allows slow traffic through, however browsing the Internet and downloading is not possible.
  - "Disabling" the network, without disconnecting the connection, stops all traffic.

  This is a security flaw, since "Disconnecting" the LAN should have the
  same effect as unplugging the LAN cable from the network port, thus
  not allowing any traffic to get through.

  The attached screenshots show that for a period of 2 minutes 45
  seconds, my PC have received 109 packets (6.4 kB) and sent 2 packets
  (0.2 kB), while being "disconnected".

  When clicking on the network applet icon, I see the following
  lines/options:

  Wired network
  Wired connection 1
  Disconnect

  VPN connections
  Enable Networking (Checked)
  Connection Information
  Edit Connections

  I suspect that the disconnect/disable anomaly is the result of
  installing Gnome3 over Unity.

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