When this fix will appear in official kernel-release?
Yesterday i updated Trusty Tahr/14.04 to 3.13.0-103-generic and this problem is 
still present.
This is a problem for all people who use 14.04 in high frequented environments, 
just like nameservers.

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  Setting net.ipv4.neigh.default.gc_thresh1/2/3 on 3.13.0-97.144 or
  later causes 'invalid argument' error

Status in linux package in Ubuntu:
  In Progress
Status in linux-lts-trusty package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  Fix Committed

Bug description:
  Setting net.ipv4.neigh.default.gc_thresh1/2/3 on the 3.13.0-96-generic
  kernel and below worked fine using the following:

  $ sudo /sbin/sysctl -w net.ipv4.neigh.default.gc_thresh1=128

  As of 3.13.0-97-generic, though, it no longer works as expected:

  $ sudo /sbin/sysctl -w net.ipv4.neigh.default.gc_thresh1=128
  error: "Invalid argument" setting key "net.ipv4.neigh.default.gc_thresh1"

  There are two potentially related revisions in the -97 release -
  backport-trusty&id=563cf19389d8e999e69d6c94995966aeaf7c3a08 and

  The expected behavior is that changing neighbor table settings works
  using 'sysctl -w' with the same values as before the -97 kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-98-generic 3.13.0-98.145~precise1
  ProcVersionSignature: Ubuntu 3.13.0-98.145~precise1-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-98-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu17.13
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', 
'/dev/snd/pcmC0D1p', '/dev/snd/midiC0D0', '/dev/snd/seq', '/dev/snd/timer'] 
failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info: Error: [Errno 2] No such file or directory
  Card0.Amixer.values: Error: [Errno 2] No such file or directory
  CurrentDmesg: [    4.586115] NET: Registered protocol family 40
  Date: Wed Oct 19 06:13:36 2016
  HibernationDevice: RESUME=UUID=d32abfeb-623f-4c11-ae4a-a7babe8c2139
  InstallationMedia: Ubuntu-Server 12.04.5 LTS "Precise Pangolin" - Release 
amd64 (20140806.1)
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: VMware, Inc. VMware Virtual Platform
  MarkForUpload: True
   PATH=(custom, no user)
  ProcFB: 0 svgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-98-generic 
root=UUID=febea164-78c3-4d3a-a0ce-0f09990df608 ro find_preseed=/preseed.cfg 
noprompt quiet
   linux-restricted-modules-3.13.0-98-generic N/A
   linux-backports-modules-3.13.0-98-generic  N/A
   linux-firmware                             1.79.16
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/02/2015
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00
  dmi.board.name: 440BX Desktop Reference Platform
  dmi.board.vendor: Intel Corporation
  dmi.board.version: None
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.product.name: VMware Virtual Platform
  dmi.product.version: None
  dmi.sys.vendor: VMware, Inc.

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