What Interface outgoing?

[wf-me]

Hello guys,

I’ve got a question. I have ntopng (2.4.2017) installed on my pfsense (2.3.3).
Is it possible to see what WAN Interface is a client using?
E.G.  I am in „Flows“ menu and i can see that 192.168.20.5 is visiting amazon.de. But i don’t know which Gateway/Interface he is using.
Is it possible to see this? Like:

192.168.20.5 in LAN -> WAN 1 (VDSL) -> Amazon.de

Now i have to check if the same bandwith exists on one of our WAN Interfaces to see which he is currently using.

I hope you understand my question with my poor english knowledge  :)

Greetings,

Max