Netfilter Port Forwarding Problem

[Makara <kingofyuri@yahoo.com>]

Hi all,

I have 2 internet connections ip $ipinet1 for other
traffics and $ipinet2 for mail it works properly.
I want to allow the connection from internet connect
to my local web server(172.16.0.4) via $ipinet1 so I
do port forwarding

iptables -A PREROUTING -t nat -i $ifinet1  -d $ipinet1
-p tcp --dport 80 -j DNAT  --to 172.16.0.4:80

I allow FORWARD Rule from firewall to my local
webserver

iptables -A FORWARD -m state --state
RELATED,ESTABLISHED -j ACCEPT

iptables -A FORWARD -p tcp --dport 80 -i $ifinet1 -o
$iflocalnet -j ACCEPT

I don't know why it does work? if you have any idea
please help.

Thanks

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