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List:       netfilter
Subject:    Re: Catching un-DNAT'ed packets
From:       =?koi8-r?Q?=F0=CF=CB=CF=D4=C9=CC=C5=CE=CB=CF_?=
Date:       2006-12-26 16:25:33
Message-ID: 1167150333.4663.4.camel () localhost ! localdomain
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В Вто, 26/12/2006 в 12:09 +0100, Pascal Hambourg пишет:

> > Where does the un-DNAT occurs and is there table/chain that is
> > processed after un-DNAT?
> 
> In 2.4 kernels, when DNAT occurs in the PREROUTING chain, un-DNAT occurs 
> at the same place as (and in place of) the POSTROUTING chain of the 
> 'nat' table, and there is no chain after it. In 2.4 kernels >= 2.4.19, 
> when DNAT occurs in the OUTPUT chain, un-DNAT occurs after the INPUT 
> chain of the 'filter' table, and there is no chain after it either. I 
> suppose it has not changed in 2.6 kernels.
> 
> > The problem I have is that replay packets got catched with real source
> > address, not the one the client has initially connected to. I was
> > catching replay packets in mangle/POSTROUTING.
> 
> The POSTROUTING chain of the 'mangle' table is just before the un-DNAT 
> place.

Thanks for the replay. You just confirmed my thoughts. It's really
strange to have a need solution for which is not invented yet :-/. I'm
not used to be one of the first in this area :)

So, this is subject for a wishlist...

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


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