Instance deployed on flat network is not accessible from outside [closed]

asked 2018-04-03 09:20:58 -0500

Sheetal gravatar image

updated 2018-04-03 17:08:28 -0500

Hi, I have installed RDO queens via packstack , My VM has single NIC = ens192 ( and it is all-in-one topology (controller and compute on same node).

I used below command for installation:

nohup packstack --allinone --provision-demo=n --os-neutron-ovs-bridge-mappings=extnet:br-ex --os-neutron-ovs-bridge-interfaces=br-ex:ens192 \
--os-neutron-ml2-type-drivers=vxlan,flat,vlan --os-neutron-ml2-flat-networks=extnet --os-heat-install=y --keystone-admin-passwd=password &

Post installation, bridge br-ex is created.

I want to create flat network so that instances created can be accessible from outside and vice versa.

So I made below changes in ml2_conf.ini and openvswitch_agent.ini

file : ml2_conf.ini

type_drivers = local,flat,vlan
flat_networks = physnet1

File : openvswitch_agent.ini

tenant_network_type = local,flat,vlan
network_vlan_ranges = physnet1
enable_tunneling = True
bridge_mappings = physnet1:br-ex
physical_interface_mappings = physnet1:br-ex

I created external network of type flat with subnet allocation pool start :, end:, dhcp_enabled=true (Note : If dhcp_enabled=false, deployed instance does not get IP)

I deployed a instance on this created external n/w , ifconfig command in instance shows the IP but I can not ping this IP from my machine,

This deployed instance can only ping controller node (, it can not ping gateway IP :

I have applied security rules to deployed instance.

Can some one help me what should I do to reach IP from outside ?

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Closed for the following reason the question is answered, right answer was accepted by mary_grace
close date 2018-06-26 00:13:41.557181


Some config values can’t be changed after deploying Neutron. For example, see the warning message in the installation guide.

Bernd Bausch gravatar imageBernd Bausch ( 2018-04-03 17:06:17 -0500 )edit

Try setting the correct parameters in the packstack command.

Bernd Bausch gravatar imageBernd Bausch ( 2018-04-03 17:07:45 -0500 )edit

@Sheetal - it looks like Bernd gave you some suggestions above. I'm going to close out this question -- if you run into more issues after trying his suggestions, feel free to open another question!

mary_grace gravatar imagemary_grace ( 2018-06-26 00:12:47 -0500 )edit