Bug was fixed in a general neutron documentation update.

** Changed in: neutron
       Status: Confirmed => Fix Released

** Changed in: neutron
     Assignee: Rohan Arora (ra271w) => (unassigned)

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      Change tunnel MTU calculation to support IPv6

Status in neutron:
  Fix Released

Bug description:
  Dear bug triager. This bug was created since a commit was marked with 
  Your project "openstack/neutron" is set up so that we directly report the 
documentation bugs against it. If this needs changing, the docimpact-group 
option needs to be added for the project. You can ask the OpenStack infra team 
(#openstack-infra on freenode) for help if you need to.

  commit 51a697817da849c8f9dae9651f17cd863e170fdc
  Author: Brian Haley <brian.ha...@hpe.com>
  Date:   Mon May 23 15:50:06 2016 -0400

      Change tunnel MTU calculation to support IPv6
      The IPv6 header is twice the size of the IPv4 header, 40 vs 20
      bytes, but the tunnel overhead constants are static, only
      accounting for an IPv4 header in all cases.  In order to be
      correct it needs to treat the tunnel overhead different from
      the IP overhead at L3.
      This required removing the 20 byte IP overhead from the tunnel
      type overhead constants and creating a new option,
      ml2.overlay_ip_version, in order for the server to know which
      version will be used, since it calculates the MTU for the network.
      A version mis-match will now cause a tunnel sync to fail on
      the server.
      Moved all MTU tests to a common location to remove duplication.
      Change-Id: Ia2546c4c71ff48b9fe2817fbad22b1fbf85f325b
      Closes-bug: #1584940

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