Hi Dong, 

Can you please clarify this blueprint? Currently in Neutron, If an instance has 
a floating IP, then that will be used for both inbound and outbound traffic. If 
an instance does not have a floating IP, it can make connections out using the 
gateway IP (SNAT using PAT/NAT Overload). Does the idea in this blueprint is to 
implement PAT on both directions using only the gateway IP? Also, did you see 
this one [1]? 


[1] https://blueprints.launchpad.net/neutron/+spec/router-port-forwarding 
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