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Re: Help:How to set TCP RTT?
Just set the different link delay when u create the link in ns script! This is
the meaning of different RTT in DiffServ.
Good Luck,
Ling
-----Original Message-----
From: Fan Wang <[email protected]>
To: [email protected] <[email protected]>
Cc: [email protected] <[email protected]>
Date: Sunday, November 22, 1998 8:43 PM
Subject: Help:How to set TCP RTT?
>Hi, all
>
>I am new to NS.
>
>I have read in some papers, e.g.,
>draft-ibanez-diffserv-assuared-eval-00.pdf
>
>which reported a simulation scenario (with one
>bottleneck link) where an RTT of 100ms for all
>40 TCP connections was used. My understanding is
>that RTT depends on link delays and queueing delay
>and should vary from connection to connection.
>
>I was wondering how to set the RTT for a connection
>explicitly in NS in order to achieve above ideal
>case (i.e., same RTT for all connections).
>I looked through the code (tcp.cc)
>t_rtt_, t_rtxcur_ are estimated on line. BTW, which
>one, t_rtt_ or t_rtxcur_ is the RTT?
>
>I would be grateful if anyone could show me how to
>set the RTT.
>Thank you very much.
>
>
>-Fan
>
>
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