Comment by dbaxps for UPDATE as of 11/24/2014 VLAN tag 4095 has special meaning that the port is "dead" From your ovs-vsctl show report [hcuser@localhost ~]$ sudo ovs-vsctl show 62c30134-97e2-4723-b42c-9474eb333885 Bridge br-int fail_mode: secure Port "tap231aae57-ee" tag: 1 Interface "tap231aae57-ee" Port "tap0b36c82a-61" tag: 4095 Interface "tap0b36c82a-61" The last interface corresponds your private demo network Via dashboard :- Please create new demo_private1 network ( say 20.0.0.0/24), new router router2 Create interface to demo_private1 network at router2. Create gateway to public at router2. Repost new `ovs-vsctl` show. If you will still experience problems please open new question I would remove public_subnet and public network created by Neutron. Just clean up gateway to public in demo login. Then create new public network via admin account matching exactly your real network 172.16.20.0/23 with gateway matching real gateway 172.16.20.1 and with big enough allocation pool New public network should have shared status if belongs admin tenant either belong tenant services. Via CLI remove old public : source keystonerc_demo neutron router-gateway-clear router1 source keystonerc_admin neutron subnet-delete public_subnet neutron net-delete public Create new public matching real # source keystonerc_admin # neutron net-create public --router:external=True --shared # neutron subnet-create public 172.16.20.0/23 --name sub_public --enable_dhcp False \ --allocation_pool start=172.16.20.50,end=172.16.21.150 \ --gateway 172.16.20.1 Relogin to demo and make router to have gateway to new public network. Then make em1 OVS port of OVS bridge br-ex. Like this :- [root@juno1 network-scripts(keystone_admin)]# cat ifcfg-br-ex DEVICE="br-ex" BOOTPROTO="static" IPADDR="172.16.21.11" NETMASK="255.255.254.0" BROADCAST="172.16.21.255" DNS1="8.8.8.8" GATEWAY="172.16.20.1" NM_CONTROLLED="no" DEFROUTE="yes" IPV4_FAILURE_FATAL="yes" IPV6INIT=no ONBOOT="yes" TYPE="OVSIntPort" OVS_BRIDGE=br-ex DEVICETYPE="ovs" [root@juno1 network-scripts(keystone_admin)]# cat ifcfg-em1 DEVICE="em1" # HWADDR=00:22:15:63:E4:E2 ONBOOT="yes" TYPE="OVSPort" DEVICETYPE="ovs" OVS_BRIDGE=br-ex NM_CONTROLLED=no IPV6INIT=no Disable && Stop NetworkManager, enable service network && restart it.

Please, update your post with :
1. `ovs-vsctl show` 2. ip netns exec qdhcp-852f04cb-b478-4b08-ba25-77991a118497 ifconfig 3. ps -ef | grep dnsmasq 4. ls -ld /var/lib/neutron 5. ls -ld /var/log/neutron