Whitelist IP or IP range in/out using iptables

#Flush existing rules
iptables -F

# Set up default DROP rule for eth0 (Assuming eth0 is the Ethernet Port)
iptables -P INPUT DROP

# Allow existing connections to continue
iptables -A INPUT -i eth0 -m state –state ESTABLISHED,RELATED -j ACCEPT

# Accept everything from the 192.168.0.x network
iptables -A INPUT -i eth0 -s -j ACCEPT

# Allow connections from this host to
iptables -A OUTPUT -o eth0 -d -j ACCEPT

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