MODULE 2: FIREWALL
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[1] google: iptables tutorial
[2] Iptables
Tutorial 1.2.0, Oskar Andreasson, http://iptables-tutorial.frozentux.net/iptables-tutorial.html
[3] Secure Linux Firewall & VPN presented by
Somphol Boonjing at
[4] http://www.vicomsoft.com/knowledge/reference/firewalls1.html