zones

sharewall is very good

#
# Shorewall version 4.0 - Sample Zones File for one-interface configuration.
# Copyright (C) 2006 by the Shorewall Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# See the file README.txt for further details.
#-----------------------------------------------------------------------------
# For information about entries in this file, type "man shorewall-zones"
#
# For more information, see http://www.shorewall.net/Documentation.htm#Zones
#
###############################################################################
#ZONE	TYPE	OPTIONS			IN			OUT
#					OPTIONS			OPTIONS
fw	firewall
net	ipv4
#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE