We
have developed PPrate, a passive capacity estimation tool that from
packet traces (such as tcpdump files) obtains a reported accurate
narrow link capacity of a certain flow, it can be even used inside TCP.
The tool is based on pathrate algorithm and applies a number of
techniques to overcome limitation of TCP layer and applications layer
on the dispersion measurements.
For more information about how PPrate works, you can read the following
paper: PPrate : A Passive Capacity Estimation Tool.
Please send us feedback
about the results that you get with PPrate.