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that only shows you ping your interface can you ping your gateway from the router? How was the router created? Did you enable provider network? You show some data but not all. 


Remo 
> On Feb 27, 2015, at 18:52, Mitchell Chen <mitchell.chen at mediatek.com> wrote:
> 
> These is an issue that the tenant router gateway can not be pinned. Is this an OpenStack issue? It doesn’t allow all nodes to be powered off and on? Before the nodes were shut down, networking works great either from inside instances to access outside internet or from outside to access the instances. Please help:
>  
> root at neutron:/# neutron subnet-list
> +--------------------------------------+-------------+-----------------+------------------------------------------------------+
> | id                                   | name        | cidr            | allocation_pools                                     |
> +--------------------------------------+-------------+-----------------+------------------------------------------------------+
> | 318125f7-3015-44cb-80fe-f8682a997392 | demo-subnet | 192.168.2.0/24  | {"start": "192.168.2.2", "end": "192.168.2.254"}     |
> | 35501767-4b22-4ffc-9ed6-cdbe59759b9e | ext-subnet  | 172.29.105.0/24 | {"start": "172.29.105.101", "end": "172.29.105.127"} |
> +--------------------------------------+-------------+-----------------+------------------------------------------------------+
> root@ neutron:/# neutron subnet-show 35501767-4b22-4ffc-9ed6-cdbe59759b9e
> +------------------+------------------------------------------------------+
> | Field            | Value                                                |
> +------------------+------------------------------------------------------+
> | allocation_pools | {"start": "172.29.105.101", "end": "172.29.105.127"} |
> | cidr             | 172.29.105.0/24                                      |
> | dns_nameservers  |                                                      |
> | enable_dhcp      | False                                                |
> | gateway_ip       | 172.29.105.254                                       |
> | host_routes      |                                                      |
> | id               | 35501767-4b22-4ffc-9ed6-cdbe59759b9e                 |
> | ip_version       | 4                                                    |
> | name             | ext-subnet                                           |
> | network_id       | 3ef88278-b944-4ba2-a39b-0c23a2f22385                 |
> | tenant_id        | 7479d4eabeb14b45a7f38269155ec0f5                     |
>  
>  
>  
>  
> root@ neutron:/# ip netns
> qdhcp-6f4e6906-ec84-410f-bfc1-89e076791ddb
> qrouter-48cc6f75-b0a2-4468-a0bd-e6567237b7ee
>  
> root@ neutron:/# ip netns exec qrouter-48cc6f75-b0a2-4468-a0bd-e6567237b7ee ip a
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 scope host lo
>        valid_lft forever preferred_lft forever
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 35: qr-70c2c01f-83: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
>     link/ether fa:16:3e:27:83:6c brd ff:ff:ff:ff:ff:ff
>     inet 192.168.2.1/24 brd 192.168.2.255 scope global qr-70c2c01f-83
>        valid_lft forever preferred_lft forever
>     inet6 fe80::f816:3eff:fe27:836c/64 scope link
>        valid_lft forever preferred_lft forever
> 36: qg-34625a11-da: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
>     link/ether fa:16:3e:d7:2f:27 brd ff:ff:ff:ff:ff:ff
>     inet 172.29.105.101/24 brd 172.29.105.255 scope global qg-34625a11-da
>        valid_lft forever preferred_lft forever
>     inet6 fe80::f816:3eff:fed7:2f27/64 scope link
>        valid_lft forever preferred_lft forever
>  
> // From the qrouter, the gateway can be pinned
> root@ neutron:/# ip netns exec qrouter-48cc6f75-b0a2-4468-a0bd-e6567237b7ee ping -c 4 172.29.105.101
> PING 172.29.105.101 (172.29.105.101) 56(84) bytes of data.
> 64 bytes from 172.29.105.101: icmp_seq=1 ttl=64 time=0.063 ms
> 64 bytes from 172.29.105.101: icmp_seq=2 ttl=64 time=0.060 ms
> 64 bytes from 172.29.105.101: icmp_seq=3 ttl=64 time=0.059 ms
> 64 bytes from 172.29.105.101: icmp_seq=4 ttl=64 time=0.058 ms
>  
> //// Can not be pinned here:
> root@ neutron:/# ping -c 4  172.29.105.101
> PING 172.29.105.101 (172.29.105.101) 56(84) bytes of data.
>  
> --- 172.29.105.101 ping statistics ---
> 4 packets transmitted, 0 received, 100% packet loss, time 3023ms
>  
> root@ neutron:/home/stack/Openstack# neutron agent-list
> +--------------------------------------+--------------------+------------+-------+----------------+
> | id                                   | agent_type         | host       | alive | admin_state_up |
> +--------------------------------------+--------------------+------------+-------+----------------+
> | 68eba267-b885-4aad-96a4-e8d19ac9db4a | L3 agent           | mussdhux20 | :-)   | True           |
> | c0726b66-a1f4-4b00-9120-7bf0ee91a3d0 | DHCP agent         | mussdhux20 | :-)   | True           |
> | d8808f97-90f8-424d-a786-45b4541af755 | Open vSwitch agent | mussdhux04 | :-)   | True           |
> | e8d85451-3f6f-4b2a-94a1-6dd3e9a93cff | Metadata agent     | mussdhux20 | :-)   | True           |
> | f4e51873-7e18-49a4-ab6b-94c24500e25f | Open vSwitch agent | mussdhux13 | :-)   | True           |
> | f8cab47d-a0db-4de2-b457-23c4e87ccb32 | Open vSwitch agent | mussdhux10 | :-)   | True           |
> | fd9ab1c9-ce62-4504-8d68-215584a70a17 | Open vSwitch agent | mussdhux20 | :-)   | True           |
> +--------------------------------------+--------------------+------------+-------+----------------+
>  
> I also restarted the neutron services after my neutron node booted up.
> service neutron-plugin-openvswitch-agent restart
> service neutron-l3-agent restart
> service neutron-dhcp-agent restart
> service neutron-metadata-agent restart
>  
> Anyone has solutions for this kind of issue?
>  
>  
> Thank you so much for the help,
> Mitchell
>  
> From: Mark Loza [mailto:mloza at morphlabs.com <mailto:mloza at morphlabs.com>] 
> Sent: Friday, February 27, 2015 3:59 AM
> To: Mitchell Chen; openstack at lists.openstack.org <mailto:openstack at lists.openstack.org>
> Subject: Re: [Openstack] Instance can not ping each other
>  
> I assume you are using neutron instead of nova-network
> 
> On 2/27/15 7:57 PM, Mark Loza wrote:
> Hi,
> 
> Did you check if the neutron agents are all alive?
> 
> # neutron agent-list
> 
> 
> On 2/27/15 3:49 PM, Mitchell Chen wrote:
> Hi All,
>  
> I followed the OpenStack icehouse installation guide to successfully install a five node system, one control node, one neutron and three compute nodes.  Inside of the instance, I can ping other instances’ virtual IP address and outside internet fine. Recently, we decided to move all the nodes to a lab. So, I powered down the five nodes before the move and powered up them afterward. All the physical network connections were exactly the same as they were before the move. But, I can not even ping other instance after the five nodes up again. 
>  
> I typed “route –n” inside of the instance, no any IP is shown. What’s wrong? Please help how I can get the instance networking back.
>  
> Thanks,
> Mitchell     
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