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-network-with-rdo-juno-on-centos-7/


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