Iptables Tutorial 1.2.2

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$IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets

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# Special OUTPUT rules to decide which IP's to allow.

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$IPTABLES -A OUTPUT -p ALL -s $LO_IP -j ACCEPT

$IPTABLES -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT

$IPTABLES -A OUTPUT -p ALL -s $INET_IP -j ACCEPT

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# Log weird packets that don't match the above.

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$IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \

--log-level DEBUG --log-prefix "IPT OUTPUT packet died: "

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# 4.2 nat table

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# 4.2.1 Set policies

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# 4.2.2 Create user specified chains

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# 4.2.3 Create content in user specified chains

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# 4.2.4 PREROUTING chain

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# 4.2.5 POSTROUTING chain

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# Enable simple IP Forwarding and Network Address Translation

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$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP

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# 4.2.6 OUTPUT chain

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# 4.3 mangle table

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# 4.3.1 Set policies

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# 4.3.2 Create user specified chains

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# 4.3.3 Create content in user specified chains

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# 4.3.4 PREROUTING chain

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# 4.3.5 INPUT chain

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# 4.3.6 FORWARD chain

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# 4.3.7 OUTPUT chain

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# 4.3.8 POSTROUTING chain

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