Hi all 
Can the DPI in EdgeOS tell specific clients apart if they're behind another router (though not NATed)?
Specifically, say I have an ER that is connected to a Cisco 3750G layer3 switch.
The Cisco has ip routing enabled and multiple vlans set up; for the sake of the discussion let's say it's just two.
It doesn't support doing NAT, but it's doing inter-vlan routing so that the ER doesn't have to.
The Cisco's uplink port to the ER is set up as a layer3 interface on the Cisco and thus has its own /30 subnet separate from the device subnets.
The ER has a static route set back to the Cisco's layer3 IP for each individual VLAN's subnet.
Would the DPI in the EdgeRouter report all traffic as coming from the Cisco's IP or would it be able to tell individual clients on the other side of it apart? As the Cisco isn't doing masquerade-NAT, merely forwarding packets, I suspect it should be able to, but I don't want to purchase an ER-X just to find out that the main feature I want won't work at all with my network setup.
Thanks much