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unable to ping controller from instance

HI all,

I have installed openstack liberty on centos7(2 node configuration) on 2 virtual machines using vcenter. i have installed the services(keystone, glance, nova, neutron, horizon) and now can launch an instance from the dash board. i have created 2 networks and linked it using a router 1: Public (192.168.90.0/24)-"external network" is set as the router gateway 2: Private (10.10.0.0/24)

I launch an instance with the cirros image, but i am not able to ping the controller or the default gateway.

NOTE: i have added the security rules for ssh https icmp on the instance.

Can anyone please help me out on this as, i am not so good at networking part.