iptables SNAT interfering with DNAT

[steve@neptune.ca]

I've been beating my head against the table for the past couple of hours
trying to get this working properly.

I'm trying to dp a PREROUTING DNAT that will send any traffic destined to
10.10.10.8 and DNAT it to 192.168.32.12

The PREROUTING rule does that, but what keeps happening is the POSTROUTING
rules further down the chain is changing the source IP to 192.168.32.6

What I need is the POSTROUTING SNAT rule to -ONLY- take place when an
attempt to access 192.168.32.12 is established from anything else except
the PREROUTING DNAT.

here are the 2 PREROUTING and POSTROUTING entries:

$IPT -t nat -A PREROUTING -d 10.10.10.8 -j DNAT --to 192.168.32.12
$IPT -t nat -A POSTROUTING -s 172.17.0.0/19 -d 192.168.32.12 -j SNAT
--to-source 192.168.32.6

Right now, when I ssh to 10.10.10.8 it shows my source IP as 192.168.32.6
which works but I dont want the source IP changed for the DNAT

Any ideas of how to get around this ?

Thanks.
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