http://firewall-jay.sf.net is very is to setup ( actually nothing setup all menu based )for linux. i am using for years and it works very nice. you need to have 2 lan cards in your box. network sharing is onle “clik” operation 
so many features avail with this firewall. i can offer free support to setup this firewall . just leave comment here.
you can do port forwarding,nat,block local ips, you can graph traffic…etc………
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