[LARTC] catching DNAT'ed packet

[LARTC] catching DNAT'ed packet

[@ 2006-12-15 17:44 UTC (permalink / raw)]

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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Re: [LARTC] catching DNAT'ed packet

[@ 2006-12-19 10:01 UTC (permalink / raw)]

Maybe my question was too complex, I would try to make it simple...

Is it possible to catch un-DNAT'ed packet with -j ULOG target?

В Птн, 15/12/2006 в 19:44 +0200, Покотиленко Костик пишет:
> 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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