On Friday 2010-07-02 14:35, Patrick McHardy wrote:
quoted text
>>> Sure they do, if they are destined for the host itself. I'm not sure
>>> what's so hard to understand about this patch, you have f.i. multiple
>>> tunnels using the same remote network, on INPUT and POSTROUTING you SNAT
>>> them to seperate networks based on criteria like the network device or
>>> the IPsec tunnel to be able to distinguish them.
>>>    
>>
>> But they are already distinguishable by the ctmark that is applied
>> to these connections to do routing of the reply, are they not?
>>  
>
> Its not (only) about routing, you simply can't have two connections using
> the same identity.

Which is why the zone thing is added.

Ah, but I now see that you need to select a zone for it first.. touché.

Still this SNAT-on-INPUT leaves a second taste. Adding another address 
to the tunnel master and using DNAT-on-PREROUTING for local deliveries 
would have also made the connections unambiguous.
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