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[Preethi Dsilva <preethi.dsilva@xxxxxx>]

Public bug reported:

1.create network,subnet,dvr perform router interface add
2.boot a vm,
3.attach router gateway with disable-snat
4.now update router with enable-snat=true

update happens however we see that a extra sg port is created in snat
namespace for the interface added on router update which causes external
network unreachability for vm ,(here iptable rules are added for the vm
on router update)

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: l3-dvr-backlog

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https://bugs.launchpad.net/bugs/1352808

Title:
  when enable_snat is updated from false to true in a DVR vm fails to
  reach external network using snat

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  1.create network,subnet,dvr perform router interface add
  2.boot a vm,
  3.attach router gateway with disable-snat
  4.now update router with enable-snat=true

  update happens however we see that a extra sg port is created in snat
  namespace for the interface added on router update which causes
  external network unreachability for vm ,(here iptable rules are added
  for the vm on router update)

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