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Re: Trace/Loss



I have a vague impression that this was used specifically for
collisions on a LAN. Seems it disappeared now but I don't know why.

- Haobo

On Fri, 4 Feb 2000, Chris Parsa wrote:

> Hi Tiki,
> 
> Thanks for your reply.  Do you understand the difference between
> create-trace Loss and create-trace Drop.  It looks like one creates
> a Trace/Loss and the other creates a Trace/Drop.  One prints an "e"
> in the trace file and the other a "d".  other than that, I don't see
> any difference, does anyone else?
> 
> 
> Chris
> 
> On Thu, 3 Feb 2000, Tiki Suarez wrote:
> 
> > Chris,
> > 
> > Chris Parsa wrote:
> > 
> > > Hi,
> > >
> > > Does anyone know where I can find the code for Trace/Loss ?  I have
> > > the following code in my script:
> > >
> > > #create error model
> > >  set em [new ErrorModel]
> > >  $em set rate_ 0.02
> > >
> > > set tr [$ns create-trace Loss $f $n0 $n1]
> > > $em drop-target $tr
> > >
> > 
> > try
> > set tr [$ns create-trace Drop $f $n0 $n1]
> > 
> > 
> > >
> > > It runs, and marks all the dropped packets with an "e" in file "f".
> > > What I don't understand is, it looks like create-trace creates a
> > > Trace/Loss object, but I cannot find this object.
> > >
> > > Also, I don't really understand what $em drop-target $tr does.
> > >
> > 
> > $em drop-target $tr
> > places those dropped pkts into a file - check $f - it should be a
> > file that has been opened.  The packets will be dumped into that file.
> > 
> > >
> > > Chris
> > 
> > hope this  helps
> > 
> > -- tls
> > 
> > 
> 
>