[Openstack] Is it possible to use OVS inside an Openstack VM ?

David Fernandes dfernandes at toulouse.viveris.com
Wed Jun 20 08:15:03 UTC 2018

Yo are totally Right Brian !

I tried to allow the bridge address pair to the VM port using the 
following command and it works !!!

neutron port-update <VM_port_uuid> --allowed-address-pairs type=dict 
list=true mac_address=<bridge_MAC>,ip_address=<bridge_ip>

Thank you so much !!


Le 18/06/2018 à 20:21, Brian Haley a écrit :
> On 06/18/2018 06:26 AM, David Fernandes wrote:
>> Hi guys,
>> I have just 1 question. Is it possible to use OVS inside an Openstack 
>> VM ? Let me explain my issue.
>> I have created 2 Ubuntu 16.04 VMs and installed last version of OVS 
>> in both. Both VMs are connected to the same network and they can ping 
>> each other.
>> Then, I have created an OVS bridge (namely "br-test") in the first VM 
>> and I have added the port of the VM (ens1) to the ovs bridge as 
>> usual. At this point I cant't ping from one VM to the other.
>> If I perform tcpdump on the bridge (tcpdump br-test), I see that ARP 
>> requests are sent but they are not sent by the interface of the VM 
>> (ens1).
>> I tried to add the MAC addreses manually to the ARP table of each VM. 
>> When I ping, I see the same case :  icmp packets outgoing the bridge 
>> br-test but never sent by the interface ens1 of the VM.
> I can only guess things are being blocked by the MAC anti-spoofing 
> rules neutron adds - perhaps the source MAC of the bridge is being 
> used which is different from the NIC?
> -Brian
>> I have tried the same scenario using a linux bridge instead of OVS 
>> swithch and it works.
>> Do you have any idea of why there are issues binding VM interface to 
>> OVS bridges ? Any information will be really apreciated !! Thanks in 
>> advance !!!
>> David
>> _______________________________________________
>> Mailing list: 
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> Post to     : openstack at lists.openstack.org
>> Unsubscribe : 
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack

More information about the Openstack mailing list