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You don't directly configure "routing protocols" or NAT with Neutron.

NAT is configured indirectly via floating ip addresses; when you associate a floating ip address with an instance (using, e.g., nova floating-ip-associate), Neutron creates a NAT rule on the network server that is responsible for mapping betwee the instance's fixed address and the floating address.

When you associate a neutron router with an external network (via neutron router-gateway-set), this configures the routing tables inside the router namespace to use the specified network as the default gateway.