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Date: Thu, 27 Sep 2001 01:00:01 -0700 (PDT)
From: Harkirat Singh <singh@pdx.edu>
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To: "Patrick O'Reilly" <patrick@mip.co.za>
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Subject: RE: Dummynet - Burst Loss
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I appreciate your detailed reply!!

In Dummynet "bandwidth" and "queue" is used, is there a way to use queue
and bandwidth combination for burst packet loss?

Regards,

harkirat


On Thu, 27 Sep 2001, Patrick O'Reilly wrote:

> Posting back to Questions only:
>
> The only thought that occurs to me  would be to write a two line script to
> change the config of the pipe to increase the loss percentage to 80% or 100%
> (whatever suits you), then return to 0% or 5% after whatever delay you are
> after.  This could be triggered manually or even in cron if that's what you
> need.
>
> try something like this:
> ----------
> #!/bin/sh
> # Assuming your pipe number 99 matches the packet
> # stream which you want test with the 'burst loss'
> ipfw pipe 99 config plr $2
> sleep $1
> ipfw pipe 99 config plr 0
> ----------
>
> If this script is called 'loss-burst' in your current directory, you could
> invoke it like such:
>
> # ./loss-burst 3 0.95
>
> This would give you a 95% packet loss rate for 3 seconds.  I guess you could
> easily add an argument to specify the ipfw pipe number too.
>
> Hope this helps.
>
> Patrick.
>
>
> -----Original Message-----
> From: owner-freebsd-questions@FreeBSD.ORG
> [mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Harkirat Singh
> Sent: 27 September 2001 07:24
> To: net@FreeBSD.ORG
> Cc: questions@FreeBSD.ORG
> Subject: Dummynet - Burst Loss
>
>
>
> Hello!
>
>  	I want to know is it possible to create a burst of packet loss
> using dummynet. I have used Dummynet to create a random packet
> loss and quiet familiar with it. However, I did not get any information as
> how a burst of packet loss can be created.
>
> I shall be greatfull if someone can guide me about this..
>
> Regards,
>
> harkirat Singh
>
>
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