I've Configured openstack-newton using packstack, everything went well.... i've configured the routers, external network, internal network along with the subnets and the router settings....

I've launched an instance with cirros image and assigned an floating ip to it too, but the problem here is i'm unable to ping the ip-address of the instance or connect to the instance using ssh, the machine is getting connected if i'm using

" ip netns exec qrouter-4fc37274-fac5-42fa-bf70-916bbaa842c4 ping 192.168.13.54 " ==> for pinging
" ip netns exec qrouter-4fc37274-fac5-42fa-bf70-916bbaa842c4 ssh cirros@192.168.13.54 " ===> for ssh

I've configured the security groups to allow icmp and ssh

my br-ex file is

TYPE=OVSBridge PROXY_METHOD=none
BROWSER_ONLY=no BOOTPROTO=no
DEFROUTE=yes IPV4_FAILURE_FATAL=no
IPV6INIT=no IPV6_AUTOCONF=no
IPV6_DEFROUTE=no
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=br-ex
UUID=44d7e1a6-22db-36da-9fa4-ecff7a149caa
DEVICE="br-ex" DEVICETYPE="ovs"
IPADDR=192.168.12.74
NETMASK=255.255.252.0
GATEWAY="192.168.12.2"
DNS1="8.8.8.8"

my ifcfg-enp0s3

TYPE=OVSPort
DEVICETYPE="ovs"
OVS_BRIDGE="br-ex"
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=no
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=no
IPV6_DEFROUTE=no
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s3
DEVICE=enp0s3
UUID=44d7e1a6-22db-36da-9fa4-ecff7a149caa
ONBOOT=yes
AUTOCONNECT_PRIORITY=-999

Public ip of the instance is 192.168.13.54
Private ip of the instance is 10.10.2.8

ovs-vsctl file is

27ff38a8-c4a9-4cd4-98cd-2e89c0d92f27
Manager "ptcp:6640:127.0.0.1"
is_connected: true
Bridge br-ex
Controller "tcp:127.0.0.1:6633"
is_connected: true
fail_mode: secure
Port phy-br-ex
Interface phy-br-ex
type: patch
options: {peer=int-br-ex}
Port br-ex
Interface br-ex
type: internal
Port "enp0s3"
Interface "enp0s3"
Bridge br-tun
Controller "tcp:127.0.0.1:6633"
is_connected: true
fail_mode: secure
Port patch-int
Interface patch-int
type: patch
options: {peer=patch-tun}
Port br-tun
Interface br-tun
type: internal
Bridge br-int
Controller "tcp:127.0.0.1:6633"
is_connected: true
fail_mode: secure
Port "tap8d8059c0-d6"
tag: 5
Interface "tap8d8059c0-d6"
type: internal
Port patch-tun
Interface patch-tun
type: patch
options: {peer=patch-int}
Port int-br-ex
Interface int-br-ex
type: patch
options: {peer=phy-br-ex}
Port "qvof36eda0a-02"
tag: 5
Interface "qvof36eda0a-02"
Port "qvoe60174b6-72"
tag: 1
Interface "qvoe60174b6-72"
Port "tapb5d2b750-ed"
tag: 1
Interface "tapb5d2b750-ed"
type: internal
Port "tap7a19b05a-02"
tag: 3
Interface "tap7a19b05a-02"
type: internal
Port "qr-6699743b-3d"
tag: 1
Interface "qr-6699743b-3d"
type: internal
Port "qg-7999c2fc-f7"
tag: 3
Interface "qg-7999c2fc-f7"
type: internal
Port "qg-81e47a12-7c"
tag: 4
Interface "qg-81e47a12-7c"
type: internal
Port "tapf24f2e69-60"
tag: 2
Interface "tapf24f2e69-60"
type: internal
Port "qg-1a80e610-9d"
tag: 6
Interface "qg-1a80e610-9d"
type: internal
Port br-int
Interface br-int
type: internal
Port "qr-954c980c-9c"
tag: 5
Interface "qr-954c980c-9c"
type: internal
Port "qr-3bd23302-c4"
tag: 2
Interface "qr-3bd23302-c4"
type: internal
ovs_version: "2.6.1"

need help from you guys, thanks in advance