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[Xav Paice <xavpaice@xxxxxxxxx>]

Public bug reported:

In the function db._get_router_for_floatingip() we check that the router
has a suitable gateway IP, but we do not check if that router is the
default gateway for that subnet.  When multiple routers exist with ip
addresses in both the subnet for the instance, plus the gateway subnet,
the function returns the first router it finds rather than the one that
instances are using as default gateway.

Can we check a condition such as router_gw_qry.floating_ip ==
subnet_db['gateway_ip'] in addition to checking has_gw_port?

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1458471

Title:
  get_router_for_floatingip does not check if router is default gateway

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  In the function db._get_router_for_floatingip() we check that the
  router has a suitable gateway IP, but we do not check if that router
  is the default gateway for that subnet.  When multiple routers exist
  with ip addresses in both the subnet for the instance, plus the
  gateway subnet, the function returns the first router it finds rather
  than the one that instances are using as default gateway.

  Can we check a condition such as router_gw_qry.floating_ip ==
  subnet_db['gateway_ip'] in addition to checking has_gw_port?

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