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** Tags added: sg-fw

** Tags added: metering

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https://bugs.launchpad.net/bugs/1618879

Title:
  iptables rule always be thrashed when update a little rule

Status in neutron:
  Fix Released
Status in OpenStack Security Advisory:
  Won't Fix

Bug description:
  When update meter label or rule, iptables_manager will update iptables
  rule in router's namespace. In order to, it will clean traffic counter
  number collected in interval time, the other iptables always trashing
  that will clean old iptalbes rule and generate new same significance
  iptables rule.

  the example from update meter label:
   
  Generated by iptables_manager
  *filter
  :neutron-meter-neutron-met - [0:0]
  :neutron-meter-r-00599199-632 - [0:0]
  -I FORWARD 2 -j neutron-meter-FORWARD
  -D FORWARD 4
  -I INPUT 1 -j neutron-meter-INPUT
  -D INPUT 3
  -I OUTPUT 2 -j neutron-meter-OUTPUT
  -D OUTPUT 4
  -I neutron-filter-top 1 -j neutron-meter-local
  -D neutron-filter-top 3
  -D neutron-meter-l-00e4e019-099 1
  -I neutron-meter-l-00e4e019-099 1
  -D neutron-meter-l-01e4e019-099 1
  -I neutron-meter-l-01e4e019-099 1
  -I neutron-meter-r-00599199-632 1 -i qg-f0732f6f-8e -d 192.168.10.0/24 -j neutron-meter-l-00599199-632
  COMMIT
  # Completed by iptables_manager
  # Generated by iptables_manager
  *raw
  -I OUTPUT 1 -j neutron-meter-OUTPUT
  -D OUTPUT 3
  -I PREROUTING 1 -j neutron-meter-PREROUTING
  -D PREROUTING 3
  COMMIT
  # Completed by iptables_manager

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