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[ns] How to calculate the RTT in edge router?



Hi,
I want to implement functionality that requires dynamically
calculating RTT times for a TCP flow passing through edge router for Differentiated Services. 
I cannot make use of the TCP Agent's RTT data, since the node in question can be an
intermediate node in a data path, without a TCP Agent associated with it.  I
want to calculate the RTT between that node and the destination, ignoring
any previous nodes in the data path.

So, I'm not sure how to solve the problem of calculating a TCP flow's RTT
between a given node and the flow's destination.  If anyone has any
suggestions, the help would be appreciated greatly.

Thanks,
Xu zuhua