Hi akisakye,

I managed somehow to have host <-> guest network connection (ping instances from host and vice versa) but still can not propagate the internet. I have created the pubic network as flat and managed to access my br-ex pub ip (ovs gw) using the vm instances . Here is what I have done till now.

host nic pub ip: x.xy.9.244/32
br-ex (ovs) pub ip:x.xy.28.25/29
instances pub ip range:x.xy.28.26-30 -> gw ovs pub ip
default gw dev host nic:x.xy.9.193

What is strange, I can ping from the internet my br-ex pub ip but can not ping instances. There is no security group issue since I have put any any bidirectional.

I can't use switch "--os-neutron-ovs-bridge-interfaces=br-ex:enp0s31f6" its kind of https://www.rdoproject.org/networking/neutron-with-existing-external-network/ (bug) and also I can not add to the ovs the host ip and the port nic since Im using the ovs br-ex as gateway for my pub subnet.

It seams that the ovs is not aware for my host physical interface or... can be a route issue (all the routes are directly connected).

Thanks in advance,