KnetmonApplet is a KDE 3 kicker applet for monitoring network interfaces activity. It displays two diagrams showing the load of a network interface.
One for received bytes and the other for transmited bytes.
It also displays leds indicating interfaces activity.
Since version 0.9 it supports multiple graphs monitoring different interfaces. See README for details.
A single right click on a graph pops up a menu from which you can quickly select the interface
(you must configure this interface in the configuration dialog before it appears in the menu).
A single left click on a graph brings a dialog which displays bigger graphs.
The configuration dialog allows you to choose the interface, and some other things.
Proc filesystem mounted on /proc
You can download the latest sources from here