RTT of TCP

[Xiao Hannan <engp8803@nus.edu.sg>]

Dear all,

What's the unit of variables for RTT estimations of TCP in NS? From the
documentation, the RTT samples are computed as the difference between the
current time and a "time echo" field in the ACK packet. So is RTT in unit of
time? 

I let a TCP session run over a link with 20ms delay. Then I  monitor that
the srtt_ of TCP is 8, and rttvar_ is 2 during a simulation time of 10s.
Then, what's the relationship between these value?  

Thanks a lot
Hannan