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+arno-iptables-firewall is a front-end for iptables. Its configuration
+script will setup a secure and restrictive firewall by just asking a
+few questions. This includes configuring internal networks for Internet
+access via NAT and network services like http or ssh. Moreover, it 
+provides many advanced additional features that can be enabled in the
+well documented configuration file.
+
+PLEASE NOTE - The setup script is NOT going to be run automatically
+after your package is installed. In order to do that, you'll have to
+issue the following command:
+
+# arno-iptables-firewall-configure
+
+To enable firewall startup at boot-time you'll need to create a symlink
+as follows (remove the link to disable automatic firewall startup):
+
+# ln -sv /etc/rc.d/rc.arno-iptables-firewall /etc/rc.d/rc.firewall
+# chmod +x /etc/rc.d/rc.arno-iptables-firewall
+
+When everything is ready you can start the firewall manually with one
+of the following commands:
+
+# /etc/rc.d/rc.arno-iptables-firewall start
+
+# arno-iptables-firewall start
+
+IMPORTANT - Here are some security notes from the upstream author:
+
+1) If possible, make sure that the firewall is started before the (ADSL)
+Internet connection is enabled. For a ppp-interface that doesn't exist
+yet you can use the wildcard device called "ppp+" (but you can only use
+ppp+ if there aren't any other ppp interfaces).
+
+2) Don't change any (security) settings ('EXPERT SETTINGS') if you don't
+really understand what they mean. Changing them anyway could have a big
+impact on the security of your machine.
+
+3) A lot of people complain that their server stopped working after
+installing the firewall. This is the CORRECT behaviour for a firewall:
+blocking ALL incoming traffic by default. Configure your e.g. OPEN_TCP
+accordingly.