hi, openstack - tripleo installed and was able to launch the instances. Machine has two interfaces, eth2 for external(WAN 192.168.35.0/24) and eth3 for internal(LAN 10.0.20.0/24). issue: unable to reach route interface by following command. (in this case, my route ipaddres 10.0.1.73) * openstack network create public * openstack subnet create --network public public --subnet-range 10.0.1.0/24 --allocation-pool start=10.0.1.40,end=10.0.1.80 --dns-nameserver 8.8.8.8 --gateway 10.0.1.1 --no-dhcp * openstack network create public --provider-physical-network datacentre --provider-network-type vlan --provider-segment 1 --external --share here is my ml2_conf.ini ******************************************************** [ml2] type_drivers=geneve,vlan,flat tenant_network_types=geneve mechanism_drivers=ovn path_mtu=0 extension_drivers=qos,port_security,dns [ml2_type_geneve] max_header_size=38 vni_ranges=1:65536 [ml2_type_vlan] network_vlan_ranges=datacentre:1:1000 [ml2_type_flat] flat_networks=datacentre #[linux_bridge] #physical_interface_mappings = datacentre:br-ex #physical_interface_mappings = datacentre:ens20f2 [ovn] ovn_nb_connection=tcp:10.0.1.158:6641 ovn_sb_connection=tcp:10.0.1.158:6642 ovsdb_connection_timeout=180 neutron_sync_mode=log ovn_l3_mode=True vif_type=ovs ovn_metadata_enabled=True enable_distributed_floating_ip=True dns_servers= ovn_emit_need_to_frag=False **************************************************************** here is my controller network: (ens2042 external and ens2043 internal interfaces) [root@overcloud-controller-0 ~]# ip a |more 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens20f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master ovs-system state UP group default qlen 1000 link/ether 00:25:90:fe:0f:dc brd ff:ff:ff:ff:ff:ff inet6 fe80::225:90ff:fefe:fdc/64 scope link valid_lft forever preferred_lft forever 3: ens20f1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether 00:25:90:fe:0f:dd brd ff:ff:ff:ff:ff:ff 4: ens20f2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:25:90:fe:0f:de brd ff:ff:ff:ff:ff:ff inet 192.168.35.86/24 brd 192.168.35.255 scope global dynamic noprefixroute ens20f2 valid_lft 39528sec preferred_lft 39528sec inet6 fe80::f2d5:4cdf:ab4f:4f14/64 scope link noprefixroute valid_lft forever preferred_lft forever 5: ens20f3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:25:90:fe:0f:df brd ff:ff:ff:ff:ff:ff inet6 fe80::225:90ff:fefe:fdf/64 scope link valid_lft forever preferred_lft forever 6: ib0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 4092 qdisc fq_codel state DOWN group default qlen 256 link/infiniband 80:00:02:08:fe:80:00:00:00:00:00:00:e4:1d:2d:03:00:21:eb:51 brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff 7: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether fa:8f:18:e9:44:e6 brd ff:ff:ff:ff:ff:ff 8: br-ex: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000 link/ether 00:25:90:fe:0f:dc brd ff:ff:ff:ff:ff:ff inet 10.0.1.179/24 brd 10.0.1.255 scope global br-ex valid_lft forever preferred_lft forever inet6 fe80::225:90ff:fefe:fdc/64 scope link valid_lft forever preferred_lft forever 9: vlan1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000 link/ether 42:f0:35:f5:cf:5f brd ff:ff:ff:ff:ff:ff inet 10.0.1.179/24 brd 10.0.1.255 scope global vlan1 valid_lft forever preferred_lft forever inet 10.0.1.141/32 brd 10.0.1.255 scope global vlan1 valid_lft forever preferred_lft forever inet 10.0.1.158/32 brd 10.0.1.255 scope global vlan1 valid_lft forever preferred_lft forever inet6 fe80::40f0:35ff:fef5:cf5f/64 scope link valid_lft forever preferred_lft forever 10: br-int: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether 76:36:79:8f:4f:b7 brd ff:ff:ff:ff:ff:ff 11: genev_sys_6081: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65000 qdisc noqueue master ovs-system state UNKNOWN group default qlen 1000 link/ether 0e:59:d6:99:85:78 brd ff:ff:ff:ff:ff:ff inet6 fe80::c59:d6ff:fe99:8578/64 scope link valid_lft forever preferred_lft forever Note: I tried with 192.168.35.0/24/200.168.35.0/24 for the external network topology as well. Thanks, Vinesh ---------------