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: <font color=blue><strong><A HREF="PPrate.pdf">PPrate : A Passive Capacity Estimation Tool</A></strong></font>.<br><br>

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<font color=blue>Download 
<A HREF="PPrate.tar">Matlab code of PPrate</A>
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Please <a href="mailto:ennajjar@eurecom.fr">send us feedback</a> 
about the results that you get with <em>PPrate</em>.