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communicate between two virtual network

hi i have a icehouse red hat openstack setup with networking model =local mentioned in neutron conf file. I have following VMs (virtual instance):

1)VM A on private network net1

2)VM B on private network net2

3)VM C connected to both networks net 1 and net 2

I want VM C work as NAT between net1 and net2 by adding some IP table rules in VM C. so i can communicate from VM A to VM B but when VM B receive packet the source address should be NAT (VM C)not VM A and same when VM B send packet to VM A.

Is it possible with icehouse if yes please communicate with detailed steps.