Suggestions on best way to see what bandwidth hogs may be?

Question

Approaching some bandwidth limits on our VPS. Is there a good way to narrow down which scripts may be sucking up the most bandwidth?

Answer 1

What OS?

For Windows, showtraf

For linux, iptraf

For FreeBSD or OpenBSD, pftop

Answer 2

For looking at an ethernet pipe, nfsen/nfdump.