Re: [ns] need your help

[John Mehringer <mehringe@ISI.EDU>]

Hi,

If you want to have consistant default values across ns releases you can
always set the variables to TCP in your scripts explictly.  That way you
know what the values will be and not have to worry if the defaults
change.

- John Mehringer

Vijay D wrote:
> 
> Hi,
>   I recently installed ns-2.1b8a for windows 2000. I found that my
> results were very different from my previous results obtained from
> simulations done in sun-solaris with ns-2.1b7a. I didn't take any of
> your patches into ns-2.1b7a. I feel that, your changes to few default
> values does have an impact on the performance of TCP. So I want to
> understand, what setting I need to use (and why), which will closely
> emulate the commercially available TCP and FTP stacks. These are the
> following changes that I encountered in ns-default.tcl, from the
> previous version,
> 
> Agent/TCP set windowInit_ 2 ;          # default changed on 2001/5/26.
> Agent/TCP set syn_ true ;              # default changed on 2001/5/17.
> Agent/TCP set minrto_ 1 ;              # Default set to 1 on
> 2001/05/14.
>                                                      # Set to "0" to
> give old behavior.
> Agent/TCP set timerfix_ true ;         # Variable added on 2001/05/11
>                                                      # Set to "false"
> to give the old
>                                                       #  behavior.
> Agent/TCP set delay_growth_ true ;             # default changed on
> 2001/5/17.
> 
> Can you please help me on this ? Also is there any other changes TCP
> or FTP stack that I should be aware of  ?
> 
> Thank you very much,
> Vijay
> 
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