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transparent firewall box

Can someone recommend the following configs:
I want a box that is basically transparent to the internal clients.
          box1 box2 box3 box4
so box1 2 3 and 4 use the router's ip(s) as gateway
and not the firewall's internal ethernet.
and the router doens' knwo the difference.
But I can fireall each internal ip with separate rules.
e.g. dmz for some, ...
it would be nice to have straightforward rules like:
internal IP
	port { 80; 22; 143; ...; };
		accept from all except; };
	else deny;
Something nice like this with straightforward syntax.
any suggestions?
Anyone seen simple firwall system which allows eth0: eth0:1 eth0:2
to each have their own rules, to perform different restrictions on a
single NIC system.

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