I'm not sure NTop can show me this, but if it can, please tell me
where to look first.

We have two Internet connections via two ISPs. Both ISPs are aware of
our ASN, but the pipes are not equal so one ISP is supposed to be
"favored" over the other.

The ISP connection that is not supposed to be favored has all of our
internal users routed over it. It is the busiest connection (and the
smallest pipe).

I'm convinced that MANY of our customers and Internet users are
actually using the smaller pipe - but I'd like to verify that. I would
like, in fact, a way to display it graphically.

My current NTop implementation is on a SPAN port on a small switch.
That router for the small ISP connection has two ethernet ports, the
primary of which is plugged into the same switch as NTop. This switch
is also trunk port connected to another switch that has the bigger ISP
router connected to it (though both routers are plugged into both
switches). Therefore, I'm probably seeing some of the traffic going
through the other switch/ISP router but not all of it. If I create an
RSPAN for NTOP on that second switch I'm guessing there is going to be
some overlap...hell, I just am not sure where to put NTop to see
EVERYTHING and also differentiate - hopefully - between traffic coming
over the two ISP connections.

Though the smaller connection gets more traffic, and the bulk of that
traffic is incoming, if we're controlling it correctly I should find
that traffic to be mostly downloads initiated by our internal users...
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