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Is port forwarding of the same service running on distinct hosts behind a NAT, on the same port possible? For example, if there are two hosts 192.2.0.2 and 192.2.0.3 using the gateway(NAT) 192.2.0.1 to access the Internet both running a web server on port 80, to which host is an external client directed upon sending an HTTP request to the NAT(to its public address)?
Can a same request(towards the NAT's public address) be made from within the LAN?
Port-forwarding is intended to be used with fixed rules. Although you could write a script to switch the destination host time-to-time to "distribute" the traffic, it is not a good idea as NAT does not know about the HTTP sessions. The result would be a lot of lost connections and one host would be hit by 100% of the traffic at any given time.
You might want to use a session aware HTTP proxy/loadbalancer for this like HAProxy or nginx.
