and what you are wanting to do is something like this
(internet) <-[x]obsd firewall[i0][i1]
[x]obsd firewall[i0]-> (private address range{A} LAN with no port forewarding) [x]obsd firewall[i1]-> (private address range{B} LAN with port forwarding)
but without assigning IP addresses to i0 and i1.
And you need bridging rules for the firewall to route from i0 to i1. Is that right? And you don't want to change the private range addresses assigned to the boxes that are being port forewarded.

Yes, this is exactly what I want... :) Thanks for explaining my view.

Of course, it's not a standard terminology or diagramming method.

Do you happen to have range A and range B separated, so that all machines in range B would be in, for instance, 192.168.0.[1..15] (thus, 192.168.0.0/28) and all machines in range A would be in 192.168.0.[17..31] (thus, 192.168.0.16/28)? Or, even better, the machines in range A might be DHCP?

--
Joel Rees
    even though much of what I do is not sensible
    it does make sense if you know why ...

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