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[OpenStack Infra <1599889@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

https://review.openstack.org/320121
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
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.haley@xxxxxxx>
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.
    
    DocImpact
    
    Change-Id: Ia2546c4c71ff48b9fe2817fbad22b1fbf85f325b
    Closes-bug: #1584940

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: doc neutron

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https://bugs.launchpad.net/bugs/1599889

Title:
      Change tunnel MTU calculation to support IPv6

Status in neutron:
  New

Bug description:
  https://review.openstack.org/320121
  Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
  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.haley@xxxxxxx>
  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.
      
      DocImpact
      
      Change-Id: Ia2546c4c71ff48b9fe2817fbad22b1fbf85f325b
      Closes-bug: #1584940

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