Need Firewall OS that supports public IP's in DMZ

Well the Title sais it all. I have tried Smoothwall, IPCop, Clarkconnect, Astaro- and none of these have what I need. No mods or anything!! WHAT I NEED, is a firewall OS- that supports:

1) 3 interfaces for LAN, WAN, DMZ

2) Transparent mode on DMZ- ie. basically bridges traffic to the DMZ and ALLOWS there to be public IP's on my webserver in the DMZ.

Someone please help!!!!!!!!!!!!!
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Checkpoint Firewall-1 (
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Tim HolmanCommented:
Top Layer -, will offer transparent (L2) firewalling, plus advanced IPS and attack mitigation.
TrihimbulusAuthor Commented:
What I really need is a Firewall Operating System. Probably Linux Based (with Gui configuration). Open Source/FreeWare- we have exhausted our funds...
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Steve McCarthy, MCSE, MCSA, MCP x8, Network+, i-Net+, A+, CIWA, CCNA, FDLE FCIC, HIPAA Security OfficerIT Consultant, Network Engineer, Windows Network Administrator, VMware AdministratorCommented:
You can use ISA.

 My Watchguard X1000 does all that in a hardware box too.
You can use BSD as your base OS; IPtables for configuring the firewalling methods.
But you shall be familier with the *nix, IPtables, some of the routing stuff as well.
A good start will be or

There is a book i came across some time back."Building Linux and Openbsd Firewalls". This book also helps you to build up.

Use a netscreen with the option to configure it in layer 2.
Or check very cheap firewalls which are based on open-source. Performance is excellent.

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You can use every Firewall that can Route for direct public IP addresses, or else use nat (static or dynamic nat)
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