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[Sammy Fung <sammy@xxxxxxxxxxxx>]

I am configuring openstack to access a VM instance with public IP address
on  foslom+quantum.

I can ping to fixed IP address of a VM instance but not its floating IP, I
am looking for a debug method and solution, thanks.

I assigned floating IP to a VM instance.

# quantum floatingip-show 191cb114-8f25-4ee1-a215-a59c60e7a13c
+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| fixed_ip_address    | 10.3.1.3                            |
| floating_ip_address | 75.11.96.101                       |
| floating_network_id | 0ee08028-7edf-44b9-9af8-1297ed1a883a |
| id                  | 191cb114-8f25-4ee1-a215-a59c60e7a13c |
| port_id             | b76ca11f-052b-47e1-8677-0db3f3a81572 |
| router_id           | 91e6f0e8-94ff-4fc7-94e1-2e5c3945f4db |
| tenant_id           | 829134df7d6947f8a7386d439f05f7f7     |
+---------------------+--------------------------------------+

Hereby is current routing table on control/network node.

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
0.0.0.0         175.111.96.3    0.0.0.0         UG    0      0        0
br-ex
0.0.0.0         175.111.96.3    0.0.0.0         UG    100    0        0
br-ex
10.3.0.0       0.0.0.0         255.255.255.0   U     0      0        0 eth2
10.3.1.0       0.0.0.0         255.255.255.0   U     0      0        0
tap751ff52a-b0
75.11.96.0    0.0.0.0         255.255.255.0   U     0      0        0 br-ex
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0
virbr0

And hereby is subnet of external network in quantum.
# quantum subnet-show c429280a-a3fc-4715-b925-4797c29e12c4
+------------------+------------------------------------------------------+
| Field            | Value                                                |
+------------------+------------------------------------------------------+
| allocation_pools | {"start": "75.11.96.100", "end": "75.11.96.109"} |
| cidr             | 75.11.96.0/24                                      |
| dns_nameservers  |                                                      |
| enable_dhcp      | False                                                |
| gateway_ip       | 75.11.96.3                                         |
| host_routes      |                                                      |
| id               | c429280a-a3fc-4715-b925-4797c29e12c4                 |
| ip_version       | 4                                                    |
| name             |                                                      |
| network_id       | 0ee08028-7edf-44b9-9af8-1297ed1a883a                 |
| tenant_id        | 829134df7d6947f8a7386d439f05f7f7                     |
+------------------+------------------------------------------------------+


Anything I should check for this case ?