DNAT translate source adress problem

Hello all
I have fedora core 6 installed.
I am doing dnat (port mapping)
Here is a rule
iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 25 -j DNAT --to
192.168.0.233:25
It's doing dnat but in mail server side i can not get source ip
adress.
Can somebody explain me why do i have such problem?

Hello,

(E-Mail Removed) a écrit :
> I am doing dnat (port mapping)
> Here is a rule
> iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 25 -j DNAT --to
> 192.168.0.233:25

Note that ":25" is optional as the destination port is unchanged.

> It's doing dnat but in mail server side i can not get source ip
> adress.

What do you mean exactly ?