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[Goutham Pacha Ravi <gouthamr@xxxxxxxxxx>]

** Also affects: manila
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1629133

Title:
  New neutron subnet pool support breaks multinode testing.

Status in devstack:
  In Progress
Status in Ironic:
  New
Status in Manila:
  New
Status in neutron:
  New

Bug description:
  The new subnet pool support in devstack breaks multinode testing bceause it results in the route for 10.0.0.0/8 being set to via br-ex when the host has interfaces that are actually on 10 nets and that is where we need the routes to go out. Multinode testing is affected because it uses these 10 net addresses to run the vxlan overlays between hosts.
  For many years devstack-gate has set FIXED_RANGE to ensure that the networks devstack uses do not interfere with the underlying test host's networking. However this setting was completely ignored when setting up the subnet pools.

  I think the correct way to fix this is to use a much smaller subnet
  pool range to avoid conflicting with every possible 10.0.0.0/8 network
  in the wild, possibly by defaulting to the existing FIXED_RANGE
  information. Using the existing information will help ensure that
  anyone with networks in 10.0.0.0/8 will continue to work if they have
  specified a range that doesn't conflict using this variable.

  In addition to this we need to clearly document what this new stuff in
  devstack does and how people can work around it should they conflict
  with the new defaults we end up choosing.

  I have proposed https://review.openstack.org/379543 which mostly works
  except it fails one tempest test that apparently depends on this new
  subnet pool stuff. Specifically the V6 range isn't large enough aiui.

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