Contoh konfigurasi iptables untuk DMZ

Contoh konfigurasi iptables untuk DMZ

# set the default policy to DROP
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP

# to configure the system as a router, enable ip forwarding by
sysctl -w net.ipv4.ip_forward=1

# allow traffic from internal (eth0) to DMZ (eth2)
iptables -t filter -A FORWARD -i eth0 -o eth2 -m state –state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t filter -A FORWARD -i eth2 -o eth0 -m state –state ESTABLISHED,RELATED -j ACCEPT

# allow traffic from internet (eth1) to DMZ (eth2)
iptables -t filter -A FORWARD -i eth1 -o eth2 -m state –state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t filter -A FORWARD -i eth2 -o eth1 -m state –state ESTABLISHED,RELATED -j ACCEPT

#redirect incoming web requests at eth1 (200.0.0.1) of FIREWALL to web server at 192.168.20.2
iptables -t nat -A PREROUTING -p tcp -i eth1 -d 200.0.0.1 –dport 80 -j DNAT –to-dest 192.168.20.2 
iptables -t nat -A PREROUTING -p tcp -i eth1 -d 200.0.0.1 –dport 443 -j DNAT –to-dest 192.168.20.2

#redirect incoming mail (SMTP) requests at eth1 (200.0.0.1) of FIREWALL to Mail server at 192.168.20.3
iptables -t nat -A PREROUTING -p tcp -i eth1 -d 200.0.0.1 –dport 25 -j DNAT –to-dest 192.168.20.3

#redirect incoming DNS requests at eth1 (200.0.0.1) of FIREWALL to DNS server at 192.168.20.4
iptables -t nat -A PREROUTING -p udp -i eth1 -d 200.0.0.1 –dport 53 -j DNAT –to-dest 192.168.20.4
iptables -t nat -A PREROUTING -p tcp -i eth1 -d 200.0.0.1 –dport 53 -j DNAT –to-dest 192.168.20.4


Sumber: http://linuxforall.blogspot.com/