How can I setup private/public network for access Instance from external network

asked 2017-05-02 23:32:33 -0500

Teera W. gravatar image
 I tried to setup Network in RedHat OpenStack. By my scenario is shown below:

== Router ==
My Instance
OpenStack Host
My Laptop

But I cannot SSH into my Instance, both from OpenStack host, and from my laptop.
I'm newbie for Network configuration area, please recommend.
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Could you attach a screenshot of the network topology from horizon here? Also try pinging the router interface and router gateway from your vm in the first place. Associate a floating IP to your vm instance. Only then will you be able to ssh into.

sanjana gravatar imagesanjana ( 2017-05-03 01:11:40 -0500 )edit

Sorry, my score is <10, so I cannot attach image, but I upload to this url:

And, I cannot ping to router interface and route gateway.

Teera W. gravatar imageTeera W. ( 2017-05-03 02:17:19 -0500 )edit

can you access internet from your external network? Could you try associating floating IP to the vm instance?

sanjana gravatar imagesanjana ( 2017-05-03 03:54:37 -0500 )edit

Also what is the type of external network that you have created? flat, vlan, vxlan? could you share more details on the external network?

sanjana gravatar imagesanjana ( 2017-05-03 04:01:12 -0500 )edit

From my OpenStack host ( can acesss internet, but public network that floating ip is 192.168.80,65 can't access internet. Is it problem if my external network is in same segment with my Openstack host.

Note: My external network is vxlan type.


Teera W. gravatar imageTeera W. ( 2017-05-03 04:47:43 -0500 )edit

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answered 2017-05-08 05:37:01 -0500

Teera W. gravatar image

Hi Bernd, Sanjana,

I have successfully configured the OpenStack network. Problem is when OpenStack installed completed, the virtual adapter named br-ex is up and set initial network as DEMO configuration 172.x.x.x, and this br-ex will down after reboot. Before there is no network script to start up this interface. So I have followed steps in this two links to completed re-setup br-ex ( (

After reboot br-ex is used exisiting network configuration (IP, Gateway), and public network is work fine

Thank you very much for your help.

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Asked: 2017-05-02 23:32:33 -0500

Seen: 2,253 times

Last updated: May 08 '17