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Using iptables

sudo iptables -L
sudo iptables -A INPUT -i lo -j ACCEPT
sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
sudo iptables -A INPUT -p tcp --dport ssh -j ACCEPT
sudo iptables -A INPUT -s ###.###.###.### -p tcp --dport www -j ACCEPT
sudo iptables -P INPUT DROP
sudo iptables -L -v
sudo sh -c "iptables-save > /etc/iptables.rules"
sudo nano /etc/network/interfaces
    Append the following to appropriate interface(s):
         pre-up iptables-restore < /etc/iptables.rules
         post-down iptables-restore < /etc/iptables.rules

    http://www.frozentux.net/iptables-tutorial/iptables-tutorial.html [EDIT: 20110514]

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