I have several servers with one ethernet interface.  Currently it is connected 
via a WAN to the internet.  We are in the midst of switching to a different 
provider.  I would like to be able to operate with both temporarily until all 
the users/services get switched.  The new circuit is in and working.  I would 
like somehow to configure the system (I have pf in use) to be able to detect 
the packets that come from a specific router and route the return packets back 
through it.  The other network would be the default.  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._______________________________________________
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