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[lee jian <leejian0612@xxxxxxxxx>]

Public bug reported:

Hi,
    in my situation,there are two subnets on different openstack platforms, and I want connect them by using the vpnaas.
    10.0.1.0/24===192.0.100.15<192.0.100.15>[+S=C]...192.0.100.20---192.0.100.20<192.0.100.20>[+S=C]===20.0.2.0/24
    Since I created the external network with --no-gateway option, so the routing tables in the router's namespace are like below:
   router on openstack1: 
   10.0.1.0/24 dev qr-6ed9ea58-dd  proto kernel  scope link  src 10.0.1.1
   192.0.100.0/24 dev qg-d2d9942f-4d  proto kernel  scope link  src 192.0.100.15

    router on openstack2
   192.0.100.0/24 dev qg-fd0f7863-40  proto kernel  scope link  src 192.0.100.20
   20.0.2.0/24 dev qr-ce203452-50  proto kernel  scope link  src 20.0.2.1

    when the traffic from subnet 10.0.1.0 /24 with 20.0.2.0/24 as its
destination, there is no matching routing entry,so the traffic will be
dropped, and won't be forwarded by the vpn tunnel! So I think a static
default route entry liking  "default dev qg-d2d9942f-4d  scope link"
should be added, though the external network without a gateway!

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1354996

Title:
  when no default route entry in the router namespace, the vpnaas do not
  work!

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  Hi,
      in my situation,there are two subnets on different openstack platforms, and I want connect them by using the vpnaas.
      10.0.1.0/24===192.0.100.15<192.0.100.15>[+S=C]...192.0.100.20---192.0.100.20<192.0.100.20>[+S=C]===20.0.2.0/24
      Since I created the external network with --no-gateway option, so the routing tables in the router's namespace are like below:
     router on openstack1: 
     10.0.1.0/24 dev qr-6ed9ea58-dd  proto kernel  scope link  src 10.0.1.1
     192.0.100.0/24 dev qg-d2d9942f-4d  proto kernel  scope link  src 192.0.100.15

      router on openstack2
     192.0.100.0/24 dev qg-fd0f7863-40  proto kernel  scope link  src 192.0.100.20
     20.0.2.0/24 dev qr-ce203452-50  proto kernel  scope link  src 20.0.2.1

      when the traffic from subnet 10.0.1.0 /24 with 20.0.2.0/24 as its
  destination, there is no matching routing entry,so the traffic will be
  dropped, and won't be forwarded by the vpn tunnel! So I think a static
  default route entry liking  "default dev qg-d2d9942f-4d  scope link"
  should be added, though the external network without a gateway!

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