examples:
socat TCP-LISTEN:3389,fork TCP:192.168.2.15:3389 &
socat TCP-LISTEN:12000,fork TCP:192.168.2.15:6556 &
socat TCP-LISTEN:3389,fork TCP:192.168.2.135:3389

allow only specific resource to access the Listening port:
socat tcp4-listen:4343,fork,su=nobody,range=10.100.100.10/32 TCP:localhost:4343

>> in the example above only 10.100.100.10 is allowed to connect to port 4343

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