Question on tracing different tcp flows

[Diepchi T Tran <Diepchi.T.Tran@lerc.nasa.gov>]

Hi ns-users,
I am working on a simple wired-cum-wireless network using Mobile-ip.Its
topology is as following:

                               WL(1)                           FA(1)

W(0)-----------W(1)--------HA


                                WL(0)                           FA(0)

I set up two tcp flows (tcp1 and tcp2)which have different classes. One is
from W(0) to WL(0) and the other is from W(0) to WL(1). I use 
[$ns_ link $W(0) $W(1)] trace $ns_ $tracefile
[$ns_ link $W(1) $W(0)] trace $ns_ $tracefile

to get both tcp flows and acks on the link between W(0) and W(1). How can I
get the trace of tcp1 and tcp2 into two different tracefiles?. Please help

Thank you very much,
Cindy Tran
Diepchi Tran 
Phone (216) 433-8861
Fax   (216) 433-8705