I've setup OpenStack version 2023.2 with with devstack on a Ubuntu 22.04 baremetal. I originally had one NIC (eth1, 192.XX.XX.XX) that works fine. Now I added a second NIC (eth2, 10.XX.XX.XX) to my machine and tried to add a secondary external network through: sudo ovs-vsctl add-br br-ex2 sudo ovs-vsctl add-port br-ex2 eth2 sudo ovs-vsctl set open . external-ids:ovn-bridge-mappings=public2:br-ex2 sudo ovs-vsctl set open . external-ids:ovn-cms-options="enable-chassis-as-gw" then my whole machine (including host and all instances) lost dns service, I can only ping ip addresses such as 8.8.8.8 instead of google.com. To be precise, I found out I lose dns service after `sudo ovs-vsctl add-port br-ex2 eth2` command. (Yes, I've moved ip from eth2 to br-ex2, but didn't help) I kept on creating a network and a router: openstack network create public2 --provider-network-type flat --provider-physical-network public2 --external openstack subnet create public2-subnet --network public2 --subnet-range 10.XX.XX.0/24 --no-dhcp --gateway 10.XX.XX.1 --allocation-pool start=10.XX.XX.10,end=10.XX.XX.30 openstack router create bridge-router --external-gateway public2 openstack router add subnet bridge-router shared-public2-subnet At this point, the router is accessible from eth2 after `sudo ovs-vsctl set open . external-ids:ovn-bridge-mappings=public2:br-ex2` command, but after I tried to allocate a floating ip from public2 to any instance, the instance is just not accessible from that ip. My ultimate goal is to be able to allocate floating ip to instances from eth2, so I can access instances from both eth1 and eth2 networks, but now I lost dns service and I'm unable to access instances from the allocated eth2 floating ip. Any suggestions?