[ns] TCP max congestion window and ssthreh's values

[Mayur]

Dear ns colleagues, 

How to set max congestion window in tcp? I ns-default.tcl sets it to 0 
(Zero). How it could be if following concept is correct?

    maxcwnd (Maximum Congestion Window) indicates the maximum number 
that the CWND can achieve. ie. After tcp enters in the Congestion 
Avoidance phase, the rate of increase in CWND becomes slow (linear 
rather than exp). When it reaches MAXCWND, it stops increases. However 
if some packet loss occurs, during this process, it enters into recovery 
process, by Reseting the CWND to 1, MAXCWND to half the current CWND.

Am I conceptually (theoretically) correct? If yes, then the default 
value of maxcwnd must be some greater positive number and not zero!

    (Similar comment is due for ssthresh (Slow Start Threshold ) too, as 
it is also ZERO by default in ns!)

    As ns2 is working properly, I am sure I am mistaking /  
misunderstanding somewhre. I just want to know where.

Your expert comments are welcomed..

Mayur