NAT instance - port/IP forwarding

Question

Hi guys, I have a question regarding to NAT instance.

Here is what I am trying to do:

I have a VPN tunnel setup between my home environment and AWS. I want to use NAT gateway to route traffic depending on IP address and port number.

In example: 
If traffic from my site to AWS comes to address 1.1.1.1 (public) on port 22 it should go to NAT instance and NAT instance should send it to 192.168.1.1 (private address).

If traffic from my site to AWS comes to address 1.1.1.1 (public) on port 23 it should go to NAT instance and NAT instance should send it to 192.168.1.2 (private address).

If traffic from my site to AWS comes to address 1.1.1.2 (public) on port 22 it should go to NAT instance and NAT instance should send it to 192.168.1.4 (private address).

Is this doable with a NAT instance? I do know that ports forwarding definitely is, how about IP?

Answer

Yes, you can do this; but not with the AWS managed NAT Gateway. This sort of thing can be done in Linux using iptables but you could also use a third-party virtual appliance from the AWS Marketplace.

NAT instance - port/IP forwarding

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