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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

liquidhorse, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1098302/comments/9
regarding this being fixed with an update. For future reference you can
manage the status of your own bugs by clicking on the current status in
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box. You can learn more about bug statuses at
https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time
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future bugs you may find.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1098302

Title:
  Bonding mode Balance-ALB stomps VM MACs

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  This issue was fixed in the 3.8 kernel series; I have backported the
  appropriate patch (as directed by the netdev kernel list) to the 3.0
  kernel and it worked successfully on several machines.  I have built
  but NOT tested this patch against 3.2 and 3.4 kernels.  The patch
  appears to require minor modification for inclusion in the 3.7 kernel
  series.  The issue resolved is as follows:

  This issue affects (at the least) virtual machines running under KVM
  and using bridging to connect to a network, when that bridge
  communicates over a bond using mode-6 (balance-alb).  To replicate,
  configure a bond of 1 or more adapters with mode-6 and bridge over
  that bond.  Configure a virtual machine (in my instance, I used KVM)
  to place its vnet adapter under the same bridge.  With the VM running,
  ping the virtual machine from a remote host and check the ARP cache on
  the remote host.  You will find that the MAC reported for the virtual
  machine will not be its configured MAC, but the MAC of one of the
  bond's slaves.  This causes intermittent and significant connectivity
  losses (both to and from the virtual machine).

  The patch modifies the balance-alb bonding driver to leave non-local
  MACs unmodified.  After application, a repeat of the above test should
  result in the virtual machine's correct MAC being reported in the ARP
  cache of the remote host.

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