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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Public bug reported:

ENV:
master
devstack multinode install:
1 controller node
2 compute  nodes -> dvr_no_external  (compute1, compute2)
2 network   nodes -> dvr_snat              (network1, network2)


Problem:
For L3 DVR HA router, the centralized floating IPs nat rules are not installed in every HA node snat namespace.

How to reproduce:
1. create DVR_HA router connecting user private network and public external network
2. create a VM in dvr_no_external compute in private network
3. create floating IP and associate to the VM port

Then, only in the `master` node snat-namespace has the iptables rules.
Even the DVR_HA router has state change(backup -> master, master -> backup), the iptables rules are still not re-created in the new `master` snat-namespace.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1793527

Title:
  [dvr_no_external][ha] centralized floating IP nat rules not install in
  every HA node

Status in neutron:
  New

Bug description:
  ENV:
  master
  devstack multinode install:
  1 controller node
  2 compute  nodes -> dvr_no_external  (compute1, compute2)
  2 network   nodes -> dvr_snat              (network1, network2)

  
  Problem:
  For L3 DVR HA router, the centralized floating IPs nat rules are not installed in every HA node snat namespace.

  How to reproduce:
  1. create DVR_HA router connecting user private network and public external network
  2. create a VM in dvr_no_external compute in private network
  3. create floating IP and associate to the VM port

  Then, only in the `master` node snat-namespace has the iptables rules.
  Even the DVR_HA router has state change(backup -> master, master -> backup), the iptables rules are still not re-created in the new `master` snat-namespace.

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