Re: Interesting article about punching holes in firewalls...

Linux Advanced Routing and Traffic Control

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On Thursday 21 December 2006 09:37, Grant Taylor wrote:
> I have read the article.  I suspect that my uncertainty has to do
> with lack of how the SPI portion of the code works.  I am not
> qualified to read the source code to make an informed opinion.  I was
> (mis)believing that the SPI was very simple in the fact that it would
> classify any returning traffic coming back from a host as related. 
> Now, I'm getting the impression that this is not the case and that
> only specific packets are considered related.
>
> Can / will someone that is more versed in programming / reading
> source code please give me a brief overview of how the kernel decides
> what is and is not related.

That is not me, but I have in the past had the same question answered  
on the netfilter list. The protocol-specific helper drivers such as 
ip_conntrack_$PROTOCOL are the ones that defined state "RELATED". If 
you're not using a "helped" protocol, you will have no RELATED packets.
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