Set Up Ubuntu-Server 6.10 As A Firewall/Gateway For Your Small Business Environment - Page 2

Now do:

apt-get install libmd5-perl libnet-ssleay-perl libauthen-pam-perl libio-pty-perl shorewall dnsmasq

wget http://surfnet.dl.sourceforge.net/sourceforge/webadmin/webmin_1.330_all.deb

"surfnet" is the dutch server. Change that to "heanet"(for Ireland), "belnet"(for Belgium), "mesh" (for Germany) and so on.

dpkg -i webmin_1.330_all.deb

cp /usr/share/doc/shorewall/examples/two-interfaces/* /etc/shorewall/

cd /etc/shorewall

gunzip interfaces.gz masq.gz rules.gz policy.gz

Now open your browser and login to webmin at https://192.168.1.1:10000 as root with your root password and, using webmin's shorewall module, change the policy's and rules of your firewall as needed (for now, I only set the policy file to the example as shown, you may copy and paste my policy file for starters, if you don't like webmin).

Also set in /etc/shorewall.conf the line "IP_FORWARDING=Keep" to "IP_FORWARDING=On" (without quotes) and enable the firewall in /etc/default/shorewall.

My /etc/shorewall/policy now looks like this:

###############################################################################
#SOURCE		DEST		POLICY		LOG LEVEL	LIMIT:BURST
#
# Note about policies and logging:
#	This file contains an explicit policy for every combination of
#	zones defined in this sample.  This is solely for the purpose of
#	providing more specific messages in the logs.  This is not
#	necessary for correct operation of the firewall, but greatly
#	assists in diagnosing problems.
#
#
# Policies for traffic originating from the local LAN (loc)
#
# If you want to force clients to access the Internet via a proxy server
# on your firewall, change the loc to net policy to REJECT info.
loc		net		ACCEPT
loc	$FW	ACCEPT
loc		all		REJECT		info
#
# Policies for traffic originating from the firewall ($FW)
#
# If you want open access to the Internet from your firewall, change the
# $FW to net policy to ACCEPT and remove the 'info' LOG LEVEL.
# This may be useful if you run a proxy server on the firewall.
$FW	net	ACCEPT
$FW	loc	ACCEPT
$FW		all		REJECT		info
#
# Policies for traffic originating from the Internet zone (net)
#
net		$FW		DROP		info
net		loc		DROP		info
net		all		DROP		info
# THE FOLLOWING POLICY MUST BE LAST
all		all		REJECT		info
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE

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