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[ns] ECN!!!



hi all,
  the following is a trace of ECN enabled flow which i ran with CBR of
packet size 40. Here i find that the sender sets ecn echo flag (C) and the
receiver sets the ecn capable flag(N).but is this representation not wrong
based on the actual proposal for ECN???as far as i understand,the sender
sets the ecn capable flag(N)  and the receiver sets the ecn echo
flag(C) depending on the presence of congestion experienced flag.Here
since i see an N in the ack,there should be an E too..i am
running a CBR traffic in this case.


+ 0.1 2 3 cbr 40 C------ 0 2.0 4.0 0 0 
- 0.1 2 3 cbr 40 C------ 0 2.0 4.0 0 0 
r 0.11032 2 3 cbr 40 C------ 0 2.0 4.0 0 0 
+ 0.11032 3 4 cbr 40 C------ 0 2.0 4.0 0 0 
- 0.11032 3 4 cbr 40 C------ 0 2.0 4.0 0 0 
r 0.12064 3 4 cbr 40 C------ 0 2.0 4.0 0 0 
+ 0.12064 4 3 ack 40 ------N 0 4.0 2.0 0 1 
- 0.12064 4 3 ack 40 ------N 0 4.0 2.0 0 1 
r 0.13096 4 3 ack 40 ------N 0 4.0 2.0 0 1 
+ 0.13096 3 2 ack 40 ------N 0 4.0 2.0 0 1 
- 0.13096 3 2 ack 40 ------N 0 4.0 2.0 0 1 
r 0.14128 3 2 ack 40 ------N 0 4.0 2.0 0 1

please let me know if i am missing something here??
  thanks
  Renjish.