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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1355087

Title:
  when a interface is added after router gateway set,external
  connectivity using snat fails

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  1.create n/w,subnet
  2.create a dvr and attach the subnet
  3/create external network and attach the router gateway 
  4.now boot a vm in that subnet 
  5.ping to external network -successful
  6.create a new network,subnet attach it to router created in step 2.
  7.boot a vm and ping to external network -fails
  8.try to ping to external network using vm created in step 4 -fails

  Reason:
  =======
  when new subnet is added ,all the sg ports inside snat namespace are updated with default gateway of subnet added
  say i had subnet 4.4.4.0/24 already attached to router its sg port had ip 4.4.4.2,now when i add new subnet say 5.5.5.0/24 this router 
  sg port of 4.4.4.0/24 becomes 5.5.5.1 also sg ip of 5.5.5.0/24 also becomes 5.5.5.1 (even though 5.5.5.1 has device owner =network:router_interface_distributed and 5.5.5.2 has device owner as network:router_centralized_snat)

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