Sorry if this is not the place for questions like this, but..

Is there a program to monitor network usage by IP address and/or port?
Something like tcpdump with no packet output but only counters for
different packet types and port numbers.. and maybe a list of top 100
IP addresses and their relative byte counts?

I guess tcpdump could be modified to gather statistics like this, but
if there _is_ such a program already....

Thanks in advance,

  -jm

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