Iptables Tutorial 1.1.19

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–j icmp_packets

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# DNS server

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$IPTABLES -A FORWARD -p TCP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_DNS_IP \

–dport 53 -j allowed

$IPTABLES -A FORWARD -p UDP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_DNS_IP \

–dport 53 -j ACCEPT

$IPTABLES -A FORWARD -p ICMP -i $INET_IFACE -o $DMZ_IFACE -d $DMZ_DNS_IP \

–j icmp_packets

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# LAN section

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$IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT

$IPTABLES -A FORWARD -m state –state ESTABLISHED,RELATED -j ACCEPT

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

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

–log-level DEBUG –log-prefix "IPT FORWARD packet died: "

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# 4.1.6 OUTPUT chain

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#

# Bad TCP packets we don't want.

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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

#

# 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: "

######

# 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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$IPTABLES -t nat -A PREROUTING -p TCP -i $INET_IFACE -d $HTTP_IP –dport 80 \

–j DNAT –to-destination $DMZ_HTTP_IP

$IPTABLES -t nat -A PREROUTING -p TCP -i $INET_IFACE -d $DNS_IP –dport 53 \

–j DNAT –to-destination $DMZ_DNS_IP

$IPTABLES -t nat -A PREROUTING -p UDP -i $INET_IFACE -d $DNS_IP –dport 53 \

–j DNAT –to-destination $DMZ_DNS_IP

#

# 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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