Re: FlowMonitor Issue

[Tarik Alj <aljtarik@ozias.inrs-telecom.uquebec.ca>]

To my knowledge, you should be setting up the flow ids if you want to have 
"more" lines of output in you file. By default all your flows have a fid of 0.

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> Date: Mon, 6 Sep 1999 11:00:41 +0000 (GMT)
> From: rik@scs.leeds.ac.uk
> Subject: FlowMonitor Issue
> To: ns-users@mash.cs.berkeley.edu
> MIME-Version: 1.0
> 
> 
> I would like to obtain per-flow packet loss information for a set of
> TCP Reno connections and am using the following:
> 
> set fm [open out.fm w]
> set blink [$ns link $n10 $n11]
> set fmon [$ns makeflowmon Fid]
> $ns attach-fmon $blink $fmon
> $fmon attach $fm
> 
> $ns at 19.9 "$fmon dump"
> $ns at 20.0 "finish"      
> 
> When I set up my TCP connections, I am not assigning a 'fid' explicitly
> (correct?). My output looks like:
> 
> 19.900 0 0 0 0 256 2048 1753 1753000 0 0 1753 1753000 0 0 8 8000 8 8000
> 
> 
> So, 8 packets dropped of 1000bytes (hence 8000bytes total). However,
> there are two flows in operation but the above is the only output
> contained in my out.fm file. The FlowMonitor does not seem to be
> distinguishing between the flows.
> 
> I have a set of experiments which scale up to 5 flows and about 200
> packet drops. Unfortunately, these are all contained in a single line
> of FlowMonitor output. 
> 
> Does anyone have pointers as to how to get FlowMonitor to distinguish
> flows?
> 
> many thanks,
> rik wade


Tarik