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[ns] A NEW VARIABLE



Hi everybody
I am a green hand of ns and i am using ns-2.1b6 on Redhat Linux 6.0.
I want add a new variable in tcp.cc,because i wish change Jacobson /Karels RTT estimation.It is "oldt_rtt_".
I added in ns-default.tcl this line :
                          TCP/Agent set oldt_rtt_  0
What else do i must?
Please, help me

Thank you in advance.