kernel-packages team mailing list archive

[Dave Liebreich <dliebreich@xxxxxxxxxxxxxxx>]

we are seeing the same problem with 3.15.0-6 #11 kernel (we used an
utopic ami and added our bosh stemcell bits to it). Does that kernel
include the fix listed above?

Sorry it took so long to get this up and running our environment.

We do *not* see the problem in a precise system (3.2.0-64 #97)

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https://bugs.launchpad.net/bugs/1331150

Title:
  arp fails to update, 3.13.0-{24,29}

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  in an AWS environment managed by BOSH, we saw tcp connectivity
  problems between pairs of VMs.

  VM A and VM B are up, running ubuntu 14.04-based images, and in the
  same vpc subnet.

  VM B is terminated, and another VM is created that uses the IP address
  from VM B

  The new VM tries to make a tcp connection to VM A. In some cases, the
  connection fails.

  Investigation reveals that VM A has the old MAC address in its
  neighbor list. In some cases, running arp -d <IP Address> on VM A
  "fixes the problem". Also in some cases, running arping in gratuitous
  arp mode on the new VM also fixes the problem.

  The problem does not occur if VM A is running an ubuntu 10.04-based
  image.

  The problem seems to occur only on machines with lots of tcp
  connection traffic between them.

  'arp -d' and arping on the new VM do not seem to "fix" the problem if
  there are processes on the VMs that are trying to create new TCP
  connections.

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