iftop command

Recently I had a ton of network traffic going in and out of my machine and I couldn't figure out why. A co-worker pointed me to this tool: http://www.ex-parrot.com/pdw/iftop/ It's apparently at least 4 years old, and may be well known to a bunch of folks this email will reach, but it was new to me and I found it useful, so I thought I'd share. Does anyone know of a tool that tells you which process is generating network traffic? iftop just shows which hosts it's going to/from, which was enough for me to figure out who the culprit was in this case. Kendric Beachey