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"No route to the host " even after allowing ssh and icmp in security group

I have used devstack with neutron to setup openstack juno.
uploaded image of ubuntu 14.04lts and created instance.
Created a router and a private network and allowed public network as gateway for router.
Allocated floating ip ( in my case) to the instance and has keypair associated with it
When i ssh using ssh -i keypair.pem ubuntu@floating_ip i get No route to the host
Please help
PS - if u need some logs or stats of iptable or anything.. please comment
I am new to openstack and whole networking thing