Hi,
I am trying to configure next set up so a public host can connect to my web server located in a dmz.
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public host --> | eth1 eth2 | --> web server
x.x.x.x | 1.2.3.4 10.1.1.1 | 10.1.1.2:80
----------------------
As far as I can understand, this typically corresponds to a mix of DNAT, SNAT and FORWARD rules. Below you can find the
rules I have configured until now.
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# Enable ip forward
echo 1 > /proc/sys/net/ipv4/ip_forward
# Unlimited traffic on the loopback interface
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
# Set the default policy to drop
iptables --policy INPUT DROP
iptables --policy OUTPUT DROP
iptables --policy FORWARD DROP
iptables -t nat --policy PREROUTING DROP
iptables -t nat --policy OUTPUT DROP
iptables -t nat --policy POSTROUTING DROP
iptables -t mangle --policy PREROUTING DROP
iptables -t mangle --policy POSTROUTING DROP
iptables -t nat -A POSTROUTING -o eth1 -j SNAT --to-source 1.2.3.4
iptables -t nat -A PREROUTING -i eth1 -p tcp --sport 1024:65535 -d 1.2.3.4 --dport 80 -j DNAT --to-destination 10.1.1.2
iptables -A FORWARD -i eth1 -o eth2 -p tcp --sport 1024:65535 -d 10.1.1.2 --dport 80 -m state --state NEW -j ACCEPT
iptables -A FORWARD -i eth2 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i eth1 -o eth2 -m state --state ESTABLISHED,RELATED -j ACCEPT
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But the problem is that it doesn't work and I don't know why ? So can somebody help me to solve this problem ?
Regards
Vincent
