I'm trying to connect openstack instance from last couple of weeks, but still not successful. I tried following link: https://openstack.redhat.com/Neutron_with_existing_external_network https://ask.openstack.org/en/question/52698/connecting-to-existing-networ... Here is my configuration: ifconfig: br-ex: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.16.37.221 netmask 255.255.255.0 broadcast 10.16.37.255 inet6 fe80::58dc:cdff:fe3c:624a prefixlen 64 scopeid 0x20<link> ether b0:83:fe:75:95:9c txqueuelen 0 (Ethernet) RX packets 11160 bytes 18527350 (17.6 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 9751 bytes 1061798 (1.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 br-int: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::c071:edff:fe04:de44 prefixlen 64 scopeid 0x20<link> ether c2:71:ed:04:de:44 txqueuelen 0 (Ethernet) RX packets 42 bytes 4328 (4.2 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 8 bytes 648 (648.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 0 (Local Loopback) RX packets 504005 bytes 108257311 (103.2 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 504005 bytes 108257311 (103.2 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 p2p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::b283:feff:fe75:959c prefixlen 64 scopeid 0x20<link> ether b0:83:fe:75:95:9c txqueuelen 1000 (Ethernet) RX packets 356442 bytes 372192516 (354.9 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 157458 bytes 12175539 (11.6 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 nova secgroup-list-rules default: +-------------+-----------+---------+-----------+--------------+ | IP Protocol | From Port | To Port | IP Range | Source Group | +-------------+-----------+---------+-----------+--------------+ | tcp | 22 | 22 | 0.0.0.0/0 | | | icmp | -1 | -1 | 0.0.0.0/0 | | | | | | | default | | | | | | default | +-------------+-----------+---------+-----------+--------------+ sudo ovs-vsctl show: 077937f9-cf9d-40ca-af2b-f435153595d5 Bridge br-int fail_mode: secure Port patch-tun Interface patch-tun type: patch options: {peer=patch-int} Port br-int Interface br-int type: internal Bridge br-ex Port "p2p1" Interface "p2p1" Port br-ex Interface br-ex type: internal Bridge br-tun Port patch-int Interface patch-int type: patch options: {peer=patch-tun} Port br-tun Interface br-tun type: internal ovs_version: "2.1.3" Please help.. -- Vedsar Kushwaha M.Tech-Computational Science Indian Institute of Science