On 27 August 2010, at 05:07, Patrick Lamaiziere wrote:

> Le Thu, 26 Aug 2010 18:17:19 -0700,
> Doug Hardie <bc...@lafn.org> a écrit :
>> PF's route_to will return the packets to the proper router, but I have not
>> been able to figure out which ones those would be.  The source IP
>> address can be any on either network and its highly likely that we
>> will see packets from the same source network on both at the same
>> time.  The only distinction I see in the input packets between the
>> two paths is the MAC address of the router.  I don't see any way in
>> pf or the system to use that to affect the return path
>> though.
> the filter option "reply-to" looks to be what you need. It works by
> keeping the state of a connection (see pf.conf(5)).

That works great on the output if you can figure out which packets to use it 
on.  The only way I can see to separate the traffic is using the router MAC 
address.  I don't find anything in pf that will look at 
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