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Cannot ping/ssh to CirrOS/Ubuntu instance

I have OpenStack Havana installed I am able to launch Ubuntu/CirrOS instance but I am not able to ping or ssh to instance and vice-versa.

I had set this in local.conf

HOST_IP=192.168.171.131
FLAT_INTERFACE=eth0
FIXED_RANGE=10.11.12.0/20
FIXED_NETWORK_SIZE=4096
FLOATING_RANGE=192.168.172.128/25
MULTI_HOST=1

What public and private network configuration are recommended?