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[dino99 <1503902@xxxxxxxxxxxxxxxxxx>]

Has expirienced the same problem yesterday with the 4.2.0-15 kernel :
the speed drop down to < 50 Kb/s, when it is usually around 1 Mb/s

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https://bugs.launchpad.net/bugs/1503902

Title:
  Network stops working after inserting nf_conntrack.ko to kernel

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  While evaluating Wily for further use I found that after random period
  of time Internet connection drops (while IP stack is configured
  properly) and system message log gets quickly filled with following
  messages:

  Oct 07 14:06:25 hikari kernel: nf_conntrack: table full, dropping packet
  Oct 07 14:06:26 hikari kernel: nf_conntrack: table full, dropping packet

  Problem occurs only if I manually load nf_conntrack or related kernel
  modules or start Shorewall (which loads nf_conntrack obviously).
  Removing nf_conntrack and nf_conntrack and dependent modules fixes
  problem and restores Internet connection.

  With older builds of linux kernel (4.1.0-*) everything works as
  expected.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-14-generic 4.2.0-14.16
  ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
  Uname: Linux 4.2.0-14-generic x86_64
  ApportVersion: 2.19.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  blami      1805 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Oct  7 23:56:46 2015
  MachineType: LENOVO 2325DV5
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-14-generic root=UUID=ac8f53c6-5a42-45b3-aa74-4237647b3936 ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-14-generic N/A
   linux-backports-modules-4.2.0-14-generic  N/A
   linux-firmware                            1.148
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 03/05/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ETA0WW (2.60 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2325DV5
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ETA0WW(2.60):bd03/05/2013:svnLENOVO:pn2325DV5:pvrThinkPadX230:rvnLENOVO:rn2325DV5:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2325DV5
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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