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You might want to consider port forwarding. It will scale better than one-to-one NAT in that you can have more inside devices than public IPs. For example the web interface of your first device could NAT to port 8081 on the outside IP, the second to port 8082 of the same IP, etc.
From outside you would point your browser to the 3430's IP followed by :8081 to get to the web interface of the first inside device, etc.
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