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Working configuration should be as follows :-
Remove public network and create new external network "public" ( or whatever ) 172.16.3.0/24 with gateway having IP matching IP of real router to Internet. Floating IPs of your VMs should be also on 172.16.3.0/24
Br-ex on Network Node should have IP on 172.16.3.0/24, one of Ethernet interfaces on Network Node
should be OVS port of OVS bridge br-ex

image description

Working configuration should be as follows :-
Remove public network and create new external network "public" ( or whatever ) 172.16.3.0/24 with gateway having IP matching IP of real router to Internet. Floating IPs of your VMs should be also on 172.16.3.0/24
Br-ex on Network Node should have IP on 172.16.3.0/24, one of Ethernet interfaces on Network Node
should be OVS port of OVS bridge br-ex

image description

[root@ip-192-169-142-147 network-scripts]# cat ifcfg-br-ex
DEVICE="br-ex"
BOOTPROTO="static"
IPADDR="172.24.4.232"
NETMASK="255.255.255.240"
DNS1="83.221.202.254"
BROADCAST="172.24.4.239"
GATEWAY="172.24.4.225"
NM_CONTROLLED="no"
TYPE="OVSIntPort"
OVS_BRIDGE=br-ex
DEVICETYPE="ovs"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="yes"
IPV6INIT=no


[root@ip-192-169-142-147 network-scripts]# cat ifcfg-eth2
DEVICE="eth2"
HWADDR=00:22:15:63:E4:E2
ONBOOT="yes"
TYPE="OVSPort"
DEVICETYPE="ovs"
OVS_BRIDGE=br-ex
NM_CONTROLLED=no
IPV6INIT=no