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[Jian Wen <1252603@xxxxxxxxxxxxxxxxxx>]

** Also affects: quantum (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: neutron
       Status: New => Invalid

** Changed in: neutron
     Assignee: Jian Wen (wenjianhn) => (unassigned)

** Changed in: quantum (Ubuntu)
     Assignee: (unassigned) => Jian Wen (wenjianhn)

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https://bugs.launchpad.net/bugs/1252603

Title:
  PMTUD needs to be disabled for tunneling to work in many Grizzly
  environments.

Status in OpenStack Neutron (virtual network service):
  Invalid
Status in “quantum” package in Ubuntu:
  New

Bug description:
  In Grizzly, the version of OVS is lower than 1.9.0. As a result, tunnel path MTU
  discovery default value is set to 'enabled'. But internet-wide path MTU discovery
  rarely works, we need to add a configuration option to disable tunnel path MTU
  Discovery.

  Discussion about this issue:
    Connectivity issue from within the Instances.
    http://lists.openstack.org/pipermail/openstack/2013-August/000293.html

  Blog about this issue:
    Path MTU discovery and GRE.
    http://techbackground.blogspot.com/2013/06/path-mtu-discovery-and-gre.html

  Tunnel Path MTU Discovery default value was set to 'disabled' in OVS 1.9.0.
  Both inheritance of the Don't Fragment bit in IP tunnels (df_inherit) and path
  MTU discovery are no longer supported in OVS 1.10.0. So Linux distributions
  that ship with OVS >= 1.9.0 for Havana have no such issue.

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