Altering a packet's port

["Nicolas Ross" <rossnick-lists@xxxxxxxxxxx>]

Hi all !

I have a quite "standard" setup as follow :

192.168.7.x/24 -> iptables/router  SNAT --to-source a.b.c.d  -> internet

What I want to do, is that if a packet originites from the local net 
(192.168.7.x) on tcp port 22, that the final destination of the packet would 
wtill be the same host, but on port 8022...

Like this :

Normal :

192.168.7.1 ssh to f.g.h.i on port 22

the connection is :

192.168.7.1:sport -> f.g.h.i:8022

Is it possible ?

I've tried with REDIRECT, but it afects the destination of the packet, but I 
don't want that...

Thanks,

Nicolas