[Semibug] Network tool needed

[Mike Wayne]

My Google fu is failing me, so I'll ask here.

I'm looking for a tool to report the top traffic IP addresses over
time on a server. iperf is very close but it's screen based. I'd
just like to see the top 15-25 IP address sources/destinations since
a particular date (like the last week, the last month). I don't
need any graphs, just a number per IP address. Preference is to do
it via a simple simple tool, not with firwewall rules or client/server
stuff.

Ideally, I could say "show the last NN days" whenever but I'd settle
for a weekly and a monthly report.

Any suggestions?