flat network creation issue

asked 2019-04-19 08:14:40 -0600

Adammm gravatar image

Hello, I have installed devstack and by default is configures that networks : http://www.rapidshare.com.cn/uWpcBxI

I would like to change main/provider network to, I went to Admin-> Network -> Networks and configures that :


After that Horizon shows : Error: Failed to create network provider

Can someone help ??

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How is physical network provider configured?

Bernd Bausch gravatar imageBernd Bausch ( 2019-04-19 09:00:55 -0600 )edit

How to check it ? do you mean ip a or ifconfig cli command or the pc ?

Adammm gravatar imageAdammm ( 2019-04-19 09:36:36 -0600 )edit

2 answers

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answered 2019-04-19 09:58:31 -0600

updated 2019-04-20 20:17:30 -0600

If you didn't configure the provider network, it's the network that Devstack set up for you, and it's already used by the public network. Since it’s already used, you can’t base a new network on it. You have to configure a second external network.

Study the Networking Guide. You have to create an Openvswitch bridge and plug the NIC that connects to the network into the bridge. You then need to declare the network as a flat interface in ml2_conf.ini and map it to the Openvswitch bridge in openvswitch_agent.ini.

This is rather complex and requires a NIC that connects to your network. You should be better off just routing the provider network to your

Or perhaps you can connect the Devstack server to In this case, reinstall the server and create a new Devstack by following the Locally Accessible Guests instructions.

EDIT: See also the instructions under paragraph Neutron Networking with Open vSwitch and Provider Networks

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When you can’t ping a router’s interface (, use the traffic flow diagrams in the networking guide to trace traffic with a tool like tcpdump. I would start with the router’s network namespace.

Bernd Bausch gravatar imageBernd Bausch ( 2019-04-23 06:17:42 -0600 )edit

answered 2019-04-25 07:14:03 -0600

Adammm gravatar image

I created network again and it works fine now, I do not know what was the problem.

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Asked: 2019-04-19 08:14:40 -0600

Seen: 233 times

Last updated: Apr 24 '19