graphical bandwidth monitoring tool

[sting]

Hello,

I am looking for a real-time graphical bandwidth plotting utility that
will run on Linux and X Window, although it doesn't matter if it uses a
widget API (gtk, etc) as long as I can still export the display to an X
Server such as Cygwin or Xming.  Since I need to export the display, the
app can't take the form of a control panel in a desktop environment
(kde/gnome/etc) or something like that.

I haven't been able to find one so far.

My needs are really simple.  I just want to see a real-time graph of the
bandwidth usage (Tx/Rx) on a single interface.  I need the graph to
capture the last fews seconds/minutes/hours of activity, which means all
the console applications that just display the current usage snapshot
(iftop, bwm-ng, etc) won't do.  If it is able to recognize bandwidth usage
for a specific IP-to-IP conversation and have one plotline per
conversation, even better.

I've searched around a fair amount.  Most applications I found are either
console based or web-server based.  The console based ones usually only
offer a current snapshot (no history) and the web ones aren't real-time,
typically generating data that later gets compiled into a report.  I've
also tried etherape thinking it might do this, but it doesn't.  bmon is
the closest, but is text display.

I've examined the applications on the following pages to not avail:
   http://www.slac.stanford.edu/xorg/nmtf/nmtf-tools.html#public
   http://www.ubuntugeek.com/bandwidth-monitoring-tools-for-linux.html
   http://www.ubuntugeek.com/bandwidth-monitoring-tools-for-ubuntu-users.html

I hope I'm missing something!  Would appreciate any pointers to existing
apps.  I might write one if there really isn't anything, but I just find
it hard to believe.

Thank you.

P.S: wasn't if this question is meant for a list such as linux-net, but
there must be several users of the various applications I've mentionned
and perhaps someone has had the same need

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