[LARTC] catching DNAT'ed packet

Hi.

I have a Server's network with some servers in it, all with
192.168.1.0/25 ips. There is also a router in that network with ip
192.168.1.1. This router also connected to a client's network
10.10.0.0/16 with ip 10.10.100.1.

All services on each server are given their virtual address from one of
two virtual networks 192.168.1.128/28 and 192.168.1.144/28.
192.168.1.128/28 is for freely available services, and 192.168.1.144/28
is for services available only to authenticated ips.

There is a DNAT working on the router to map virtual ip/port to
realip/realport. That all works fine.

For axample:
 users connecting to 192.168.1.129:80 are brought to 192.168.1.2:80
 users connecting to 192.168.1.145:80 are brought to 192.168.1.2:81

I have to put all traffic I need for accounting to "-j ULOG
--ulog-nlgroup 10". And, packets should have ips seen to users. For
axample:

 10.10.102.50 -> 192.168.1.145:80
 192.168.1.145:80 -> 10.10.102.50
and
 10.10.102.50 -> 192.168.1.129:80
 192.168.1.129:80 -> 10.10.102.50

BUT, instead I have:

 10.10.102.50 -> 192.168.1.145:80
 192.168.1.2:81 -> 10.10.102.50
and
 10.10.102.50 -> 192.168.1.129:80
 192.168.1.2:80 -> 10.10.102.50

So, I can ulog the packet's in "state seen by users" only in
client->server direction, and I was unable to do that in server-clients
direction!

Here are iptables rules (I don't want to ulog packets to/from the router
itself):

iptables -t mangle -A PREROUTING -i br0 -j IPCAD_out
iptables -t mangle -A POSTROUTING -o br0 -j IPCAD_in

iptables -t mangle -A IPCAD_out -d 10.10.100.1 -j RETURN
iptables -t mangle -A IPCAD_out -d 192.168.1.1 -j RETURN
iptables -t mangle -A IPCAD_out -j ULOG --ulog-nlgroup 10

iptables -t mangle -A IPCAD_in -s 10.10.100.1 -j RETURN
iptables -t mangle -A IPCAD_in -s 192.168.1.1 -j RETURN
iptables -t mangle -A IPCAD_in -j ULOG --ulog-nlgroup 10

Is it possible to catch un-DNAT'ed packet???

-- 
Покотиленко Костик <casper@meteor.dp.ua>

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