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At last I've figured it what is missing!
Take a look:

> Hello!
> I have problems with port forwarding using IPTABLES.
> I know that such a problem was already discussed, but the solution I've
ready
> is not clear (at least for me) and does not work on my machine.
> I'm using RedHat 7.1 with kernel 2.4.13 and iptables 1.2.4.
> I'm trying to redirect ports 25 and 80, but get connection timed out.
> I've removed all my previous rules from iptables and implemented the basic
> script (taken from the howto). Here is part of it:
>
> echo "   clearing any existing rules and setting default policy.."
> $IPTABLES -P INPUT ACCEPT
> $IPTABLES -F INPUT
> $IPTABLES -P OUTPUT ACCEPT
> $IPTABLES -F OUTPUT
> $IPTABLES -P FORWARD DROP
> $IPTABLES -F FORWARD
> $IPTABLES -t nat -F
> echo "Enabling PORTFW Redirection on the external LAN.."
> $IPTABLES -A FORWARD -i $EXTIF -o $INTIF -p tcp --dport 25 -m state \
> --state NEW,ESTABLISHED,RELATED -j ACCEPT
> $IPTABLES -A PREROUTING -t nat -p tcp -d $EXTIP --dport 25 \
> -j DNAT --to 192.168.1.4:25
> $IPTABLES -A FORWARD -i $EXTIF -o $INTIF -p tcp --dport 80 -m state \
> --state NEW,ESTABLISHED,RELATED -j ACCEPT
> $IPTABLES -A PREROUTING -t nat -p tcp -d $EXTIP --dport 80 \
> -j DNAT --to 192.168.1.4:80
>

Missing line is:
$IPTABLES -A POSTROUTING -t nat -d $PORTFWIP -o $INTIF -j SNAT --to $INTIP

> echo "   FWD: Allow all connections OUT and only existing and related ones
> IN"
> $IPTABLES -A FORWARD -i $EXTIF -o $INTIF -m state --state
ESTABLISHED,RELATED
> -j ACCEPT
> $IPTABLES -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
> $IPTABLES -A FORWARD -j LOG
>
> Even when I change policy for the FORWARD chain to ACCEPT (just to try),
I'm
> not successful again.
> Can you please advise how to resolve the problem.
> Regards,
> Geo.
>
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Please keep general linux/unix/pc/internet questions off the list.

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