Port forward

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Hi all,
 
Iam trying to set up a port forward for several hours now, but I don't seem to get it working right.
When I type the following command:
iptables -A PREROUTING -p tcp --destination-port 25 -i eth0 -j DNAT --to-destination 192.168.22.6:25
I get this output:
iptables: Invalid argument
I did do iptables -X PREROUTING so the chain does exist.
Can anyone please help me out..
What I want is that all incoming connections on eth0 on port 25 are routed to another machine on the internal network 192.168.22.6
 
Thanks in advance,

Ronald Roeleveld 
System Administrator 

ASCINTERNATIONAL
Vlietweg 17c, 2266 KA, Leidschendam, The Netherlands
Tel. +31 (0)70 3178400, Fax +31 (0)70 3204760
E-mail: r.roeleveld@ascinternational.nl, Website: http://www.ascinternational.nl

 

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