netactview: a network activity viewer for linux
I was trying to find a linux equivalent for "diamondcs port explorer"/tcpview/cports. It was surprisingly hard to get this information: took well over an hour, but I finally got exactly what I needed: netactview
netactview dynamically updates what ports are in use by what application, just like tcpview/cports/etc
It's available here:
http://netactview.sourceforge.net/download.html
iftop: display bandwidth usage on an interface
iftop needs libpcap and libcurses, and helps identify which connection is sucking out all your bandwidth. Quoting the home page, "Handy for answering the question "why is our ADSL link so slow?"
iftop can also show source and destination ports in each network connection (press ? for the help screen, just like you would in top).
iftop home page
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