DNAT and accounting

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Hi,
I did not really find it yet (yes, I am a louse searcher) in the
archive, but does anybody know if it is possible to get
accounting statistics from a DNATted network?
I mean:
iptables -t nat --append PREROUTING --destination 192.168.1.0/24 \
  --jump DNAT --to-destination 192.168.1.1

How can I get accounting statistics for all the ip addressess
that are in that range?
Something like
iptables -t mangle --append PREROUTING --source 192.168.1.4
or:
iptables -t mangle --append POSTROUTING --source 192.168.1.4

As I can see it: there is no table that is able to see the
un-DNATted version of the returning packet.
In other words: if I have set up a connection to 192.168.1.4, it
will be a DNATted connection to 192.168.1.1 . But now I want to
have statistics about how much 192.168.1.1 sends back in name of
192.168.1.4 . As far as I can see, all the tables only see
192.168.1.1 as the sender of the reply packets.
-- 
mail          up    4+07:59,     4 users,  load 0.00, 0.02, 0.00
mistar1       up    1+21:11,     6 users,  load 0.00, 0.00, 0.00
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