As you've only got 4 machines on the outside and you want to keep the
same subnet numbers, sounds like you could use normal IP routing and
manually configured proxy ARP entries (per interface) to direct as
appropriate. You'd have host routes for the 4 external hosts, and a
subnet route for the internal ones.
Alternatively, you could renumber all the inside hosts to one of the
reserved ranges (10.*.*.* is my favourite) and use IP masquerading.
That gives you more flexibility to grow the network, but has its
downsides too.
Both of these process packets through the IP firewall.
-- Jamie
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