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(ASCEND) Q. How to direct unsolicited packets to a specific IP on a subnet via NAT?

I would like to have all unsolicited packets (i.e. e-mail, push contents,
etc. that are not a result of request-response) to be forwarded toward
a specific machine.

We shall assume we have a static IP from the ISP and that all unsolicited
packets (default) should be directed to just one machine.
The request-response packets should still be routed to the machines
where the request originates.

These two types of packets are diagramed below. I think a solution
to this has general importance as proxy, firewall, and many software
requires a specific and static IP that are not NAT assigned. So there shoud
be a work-around.

(1) Unsolicited
      Originator (456.456.456.456)
                                       V
      ISP assigned static IP (123.123.123.123)
                                       V
      Transfer to P75 (200.200.200.200)
                                       V
      A machine to handle unsolicited packets (200.200.200.201)
      that will run say Proxy Server, Firewall, and Exchange Server, etc.

(2) Solicited (or Request-Response type)
      User (200.200.200.102) Requests Webpage
                                        V
       Goes out via the P75 default gateway (200.200.200.200)
                                        V
       Which is mapped to ISP's static IP (123.123.123.123)
                                        V
       The rerouted to the Website (234.234.234.234)
                                        V
       Response goes back to ISP (...123) > P75 (...200) > Machine

Thanks.

Edwin



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