install

sharewall is very good

Shoreline Firewall (Shorewall) Version 4
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     This program is free software; you can redistribute it and/or modify
     it under the terms of Version 2 of the GNU General Public License
     as published by the Free Software Foundation.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

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Please see http://www.shorewall.net/Install.htm for installation
instructions.