In 2.6 kernel series, the IMQ patch allow you to change this behaviour.
For 2.4 kernels I had seen (some time ago) something about it in IMQ 
faqs or there.

You can changhe this behaviour, but I don't remember now if for 2.4 
kernels were changing some #define in any .c or .h file.

Best regards

Jarek Poplawski wrote:

> Hi!
> 
> I would like to thank very much for this great page with Kernel Packet
> Traveling Diagram and to suggest small update concerning IMQ.
> 
> I think the sentence:
> 
> "IMQ in input comes before nat so IMQ does not know the real ip address.
> Ingress comes after nat, so ingress knows the real ip address."
> 
> could be more precise like that:
> 
> "By default IMQ in PREROUTING comes before nat  and in POSTROUTING after
> nat,
> so in both cases IMQ knows ip addresses as masqueraded (nated) if it is
> used.
> This could be changed with kernel parameters IMQ_BEHAVIOR_??".
> 
> My opinion is based on IMQ patch by Patrick McHardy from www.linuximq.net.
> 
> Best regards,
> 
> Jarek Poplawski
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> LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
> 
> 

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