[ovirt-users] OVN communications between hosts

Hi all, I have a working setup of oVirt (currently 4.3.7) as self-hosted engine consisting of three virtualization hosts. Each of them has several VMs with public IP addresses which work fine. The problem is with virtual networks created on "ovirt-provider-ovn". I can create a new network with the corresponding vNIC and attach two VMs to this vNIC. If both VMs are on the same host, virtual network works, VMs can exchange packets. However, if such VMs are on different hosts, then no packets are received on both VMs. With tcpdump I see traffic going from sender VM over "ovirtmgmnt" interface. The traffic successfully leaves one host and arrives to another, so I conclude that firewall is configured properly to allow UDP 6081 traffic. What I noted are the following messages in /var/log/openvswitch/ovs-vswitchd.log (on one of the hosts): 2019-12-10T12:10:11.177Z|00009|tunnel(handler4)|WARN|receive tunnel port not found (arp,tun_id=0x2,tun_src=172.18.53.254,tun_dst=172.18.53.202,tun_ipv6_src=::,tun_ipv6_dst=::,tun_gbp_id=0,tun_gbp_flags=0,tun_tos=0,tun_ttl=64,tun_erspan_ver=0,tun_flags=csum|key,in_port=2,vlan_tci=0x0000,dl_src=56:6f:03:4b:00:1f,dl_dst=ff:ff:ff:ff:ff:ff,arp_spa=10.1.1.102,arp_tpa=10.1.1.1,arp_op=1,arp_sha=56:6f:03:4b:00:1f,arp_tha=00:00:00:00:00:00) Here 172.18.53.254 is IP of host1, 172.18.53.202 -- host2 (having this log), 10.1.1.102 -- VM IP on host1 and 10.1.1.1 -- VM IP on host2. Could you please suggest me a way to properly debug and fix this problem? I would like to be able to distribute several VMs connected to the single virtual network across hosts. Thanks in advance! -- WBR, Pavel +32478910884